Ligetech Automation Sdn Bhd
60, 62 & 64, Jalan IMJ 2,
Taman Industri Malim Jaya,
75250 Melaka, Malaysia.
+606-3365696
+606-3365697
+606-3365698
+606-3365699
+60126381968
+60126381968
LigLED Showroom Office
9, Jalan Magenta,
Taman Bertam Mutiara,
75250 Melaka, Malaysia.
+606-3365696
sales@ligetech.com.my

Latest News

Promotion!!!

Jun 7, 2017
Good news here!
We have Ramadhan Promotion in June and July.
Please contact our salesman
016 6616262 Janson Lee salesm1@ligetech.com.my
012 6185669 Garrick Ng salesm2@ligetech.com.my

or Contact with our Marketing Manager
016 7715697 Esther ligledmarketing@ligetech.com.my

Hope to receive news from you soon. Thank you.

Archidex KL 2017

Jun 7, 2017
We will have booth at Archidex 2017 on 19, 20, 21, 22 and 23 July 2017.
Come and visit us to get more information.
See you all there!

Everlight Chips

May 23, 2017
The easiest way to achieve effective agricultural lighting is to provide a spectrum of light that best replicates sunlight OR by providing the necessary spectrums / color combinations for specific functions. Color combinations vary depending on region, time, temperature, plant, plant cycle, production targets and many other factors.

EVERLIGHT has all the basic colors needed for replicating sunlight and activating specific functions for agricultural lighting. For any part of the spectrum where additional colors need to be added to the spectrum or additional light functions are needed, there are different EVERLIGHT color LEDs available for customer selection and tuning.

Nichia Chips

May 23, 2017
Having "Ever Researching for a Brighter World" as our motto, Nichia has grown in the field of development, manufacturing and sales of fine chemicals, particularly inorganic luminescent materials (phosphors). In the process of the challenging pursuit of brighter luminescent and light-emitting materials, we succeeded in developing and commercializing the super high brightness Blue LED in 1993, which greatly impressed the world. Since the first introduction of the Blue LED in 1993, we succeeded in developing the world’s first white LED by combining yellow phosphor and blue LED, followed by the successful development of practical level of blue-violet semiconductor laser for the first time in the world. The invention of these Nitride-based LED and laser diodes causes the technological innovation of light source in the field of display, general lighting, automotive, industrial equipment, and medical care & measurement. We hope that Nichia will continue to be a company that will contributes to the world by evolving its original and unique technologies in the field of manufacturing.

Osram Chips

May 23, 2017
SYLVANIA designs advanced, high-quality lighting systems for the automotive industry and aftermarket consumers. In fact, chances are your vehicle came equipped from the factory with our lights, so you can trust that our aftermarket lights match your vehicle specs precisely and are easy to install.

Advantages of LED

Nov 10, 2016
Advantages
1) Size: LEDs can be very small (smaller than 2 mm2) and are easily populated onto printed circuit boards. 

2) Cycling: LEDs are ideal for use in applications that are subject to frequent on-off cycling, unlike fluorescent lamps that burn out more quickly when cycled frequently, or HID lamps that require a long time before restarting. 

3) Efficiency: LEDs produce more light per watt than incandescent bulbs. Their efficiency is not affected by shape and size, unlike Fluorescent light bulbs or tubes. 

4) Focus: The solid package of the 
LED can be designed to focus its light. Incandescent and fluorescent sources often require an external reflector to collect light and direct it in a usable manner.

5) Slow failure: LEDs mostly fail by dimming over time, rather than the abrupt burn-out of incandescent bulbs.

6) Shock resistance: LEDs, being solid state components, are difficult to damage with external shock, unlike fluorescent and incandescent bulbs which are fragile. 

7) Toxicity: LEDs do not contain mercury, unlike fluorescent lamps.

8) Color: LEDs can emit light of an intended color without the use of the color filters that traditional lighting methods require. This is more efficient and can lower initial costs. 

9) Dimming: LEDs can very easily be dimmed either by pulse-width modulation or lowering the forward current. 

10) Cool light: In contrast to most light sources, LEDs radiate very little heat in the form of IR that can cause damage to sensitive objects or fabrics. Wasted energy is dispersed as heat through the base of the LED.

11) Lifetime: LEDs can have a relatively long useful life. One report estimates 35,000 to 50,000 hours of useful

life, though time to complete failure may be longer. Fluorescent tubes typically are rated at about 10,000 to 15,000 hours, depending partly on the conditions of use, and incandescent light bulbs at 1,000–2,000 hours. 

12) On/Off time: LEDs light up very quickly. A typical red indicator LED will achieve full brightness in microseconds. LEDs used in communications devices can have even faster response times. 

 LEDs produce more light per watt than do incandescent bulbs; this is useful in battery powered or energy saving devices.
>LEDs can emit light of an intended color without the use of color filters that traditional lighting methods require. This is more efficient and can lower initial costs.
> The solid package of the LED can be designed to focus its light. Incandescent and fluorescent sources often require an external reflector to collect light and direct it in a usable manner.
> When used in applications where dimming is required, LEDs do not change their color tint as the current passing through them is lowered, unlike incandescent lamps, which turn yellow.
> LEDs are ideal for use in applications that are subject to frequent on-off cycling, unlike fluorescent lamps that burn out more quickly when cycled frequently, or HID lamps that require a long time before restarting.
> LEDs, being solid state components, are difficult to damage with external shock. Fluorescent and incandescent bulbs are easily broken if subjected to external shock.
> LEDs can have a relatively long useful life. Reports estimates 60,000 hours of useful life, though time to complete failure longer.2 Fluorescent tubes typically are rated at about 30,000 hours, HID and MH are rated anywhere between 10,000 and 24,000 hours and incandescent light bulbs at 1,000–2,000 hours.
> LEDs mostly fail by dimming over time, rather than the abrupt burn-out of incandescent or HID bulbs.3 This provides extra safety for any area illuminated by LEDs. Even if the LEDs dim over time, they never fail completely like HID sources before needing to be replaced. LEDs need to be replaced only after they reach 30% lumen depreciation (17-20 years for quality LEDs).
> LEDs light up very quickly. A typical red indicator LED will achieve full brightness in microseconds; Philips Lumileds technical datasheet DS23 for the Luxeon Star states "less than 100ns." LEDs used in communications devices can have even faster response times.
> LEDs can be very small and are easily populated onto printed circuit boards.
> LEDs do not contain mercury, unlike compact fluorescent lamps.


Disadvantages
Some Fluorescent lamps can be more efficient. 

1) Blue hazard: There is a concern that blue LEDs and cool-white LEDs are now capable of exceeding safe limits of the so-called blue-light hazard as defined in eye safety specifications such as ANSI/IESNA RP-27.1-05: Recommended Practice for Photo biological Safety for Lamp and Lamp Systems. 




2) Light quality: Most cool-white LEDs have spectra that differ significantly from a black body radiator like the sun or an incandescent light. The spike at 460 nm and dip at 500 nm can cause the color of objects to be perceived differently under cool-white LED illumination than sunlight or incandescent sources, due to metamerism, red surfaces being rendered particularly badly by typical phosphor based cool-white LEDs. However, the color rendering properties of common fluorescent lamps are often inferior to what is now available in state-of-art white LEDs. 

3) Temperature dependence: LED performance largely depends on the ambient temperature of the operating environment. Over-driving the LED in high ambient temperatures may result in overheating of the LED package, eventually leading to device failure. Adequate heat-sinking is required to maintain long life. This is especially important when considering automotive, medical, and military applications where the device must operate over a large range of temperatures, and is required to have a low failure rate. 

4) Blue pollution: Because cool-white LEDs (i.e., LEDs with high color temperature) emit proportionally more blue light than conventional outdoor light sources such as high-pressure sodium lamps, the strong wavelength dependence of Rayleigh scattering means that cool-white LEDs can cause more light pollution than other light sources. The International Dark-Sky Association discourages the use of white light sources with correlated color temperature above 3,000 K.

 

5) Voltage sensitivity: LEDs must be supplied with the voltage above the threshold and a current below the rating. This can involve series resistors or current-regulated power supplies. 

6) High initial price: LEDs are currently more expensive, price per lumen, on an initial capital cost basis, than most conventional lighting technologies. The additional expense partially stems from the relatively low lumen output and the drive circuitry and power supplies needed. 

7) Area light source: LEDs do not approximate a "point source" of light, but rather a lambertian distribution. So LEDs are difficult to use in applications requiring a spherical light field. LEDs are not capable of providing divergence below a few degrees. This is contrasted with lasers, which can produce beams with divergences of 0.2 degrees or less.

8) Hard to find in smaller towns where consumers may have a smaller interest in this lighting alternative.
9) Significantly more expensive than regular lighting and not budget conscious.
10) Not good for residential flood lighting. You will need extra equipment to make this work
11) although they are available in many colors, the quality of the colors is not quite as good as with regular lighting

 
 
 
Advantages and Disadvantages of LED Tube Lights
16JUL
LED tube lights are designed with the latest LED lighting technology and high efficient LEDs, and they are supposed to replace conventional CFLs which are widely used for commercial lighting and residential lighting. Why LED tube lights can replace conventional CFLs? What are the advantages of LED tube lights? LED tube lights feature many advantages when compared to CFLs.
LED tube lights are of high energy efficiency. LED tube lights adopt high efficient LEDs as light source, which can achieve a luminous efficacy of 100 lumens per watt. Therefore LED tube lights can deliver the same light output as CFLs do while just consume 50% energy as CFLs do, which means by using LED tube lights to replace CFLs you will save over 50% energy bills.
LED tube lights can last over 50,000 hours, which is as ten times as the lifetime of CFLs. LED tube lights are solid state lighting fixtures, so they can last much longer than conventional lighting fixtures. During their lifetime, LED tube lights hardly need any maintenance, which will greatly save your maintenance costs. Meanwhile, you don’t have to replace bulbs frequently since they can last more than 10 years, and the bulb replacement costs they save for you can be also very considerable.
LED tube lights are green and eco-friendly lighting fixtures without any hazardous materials such as mercury and lead. They will not cause any environment pollutions when they are disposed. Unlike CFLs, LED tube lights do not emit IR or UV radiation, and they do no harm to human beings’ health.
As a matter of fact, LED tube lights are far more than the above mentioned advantages. However, LED tube lights also feature some disadvantages. LEDs are currently more expensive, price per lumen, on a startup cost basis, than more conventional lighting technologies. The additional expense partially stems from the relatively low lumen output and the drive circuitry and power supplies needed.
LED performance largely depends on the ambient temperature of the operating environment. Over-driving the LED in high ambient temperatures may result in overheating of the LED package, eventually leading to device failure.
LEDs do not approximate a “point source” of light, so cannot be used in applications needing a highly collimated beam.
 
 

  Lamp LED
Wavelength 365nm/385nm/400nm or more 250-600nm
UVA Wavelength Availability Single Wavelength Multiple Peak Wavelengths
Optical Power (@365nm) Significant development is underway to increase power efficiency Maximum 1.3 watts
Peak Irradiance (365nm) Maximum 8000 w/cm2 10500 w/cm2
Energy Consumption Low energy consumption. Can be powered by universal power adaptor. High energy requirements. Internal power supply.
Ecological Friendliness No Mercury Lamp contains mercury
On/OFF Time Instant ON/OFF 4 minute warm up
Light Source Lifetime >20,000 hours 3,000 to 4,000 hours typical
Spot Sizes 3-12mm (Significant loss of power with higher spot sizes) Variable with light guides, light lines and accessories
Adhesive Selection Small but growing. Relatively large.
Substrate Selection Heat sensitive and exacting substrates can be used such as thin film, thin plastics, foam plastic, paper, leather, etc. Minimal defect(warp, melt) of the substrate. Same substrates can be used by selecting the appropriate filter.
Available Accessories Few Many
Applications Limited due to fixed wavelengths, spot size and power. Many applications.
 

The Big 5 Exhibition 2016

Oct 17, 2016
The Big 5 Exhibition 2016
View Full Size

NEW! FLOORPLAN LAYOUT AND DEDICATED PRODUCT SECTORS

This year the Big 5 has made it even easier for you to find the products you need and the key suppliers to do business with. The brand new floorplan layout is based on the new dedicated product sectors that include:

  •          MEP Services
  •          Building Interiors & Finishes
  •          Building Envelope & Special Construction
  •          Construction Tools & Building Materials
  •          Smart Building & Design Technologies

Network and do business with more than 3,000 exhibitors from across the globe. The Big 5 continues to be the number one choice for construction industry professionals, so don’t miss out on the chance to source key suppliers, products and technologies all under one roof.

Top 10 Benefits of LED Lighting

Oct 10, 2016
Top 10 Benefits of LED Lighting
1. Long Life - LED Lighting Features Long Operational Life Time Expectations
Long life time stands out as the number one benefit of LED lights. LED bulbs and diodes have an outstanding operational life time expectation of sometimes up to 100.000 hours.
This is 11 years of continuous operation, or 22 years of 50% operation. If you leave on the LED fixture for 8h per day it would take around 20 years before you’d have to replace the LED bulb.
LED’s are different to standard lighting: They don’t really burn out and stop working like a standard light, moreover the lighting diodes emit lower output levels over a very long period of time and become less bright.
2. Energy Efficiency - LED Lighting Features A Much Better Energy Efficiency
Today’s most efficient way of illumination and lighting, with an estimated energy efficiency of 80%-90% when compared to traditional lighting and conventional light bulbs. This means that about 80% of the electrical energy is converted to light, while a ca. 20% is lost and converted into other forms of energy such as heat.
With traditional incandescent light bulbs who operate at 20% energy efficiency only, a 80% of the electricity is lost as heat. Imagine the following scenario:
If you use traditional lighting and have an electricity bill of e.g US$ 100, then US$ 80 of that money has been used to heat the room, not to light it! Using LED illumination with 80% efficiency, the electricity costs would be around US$ 20 and you’d have saved around US$ 80.
The long operational life time acts as a multiplicator and helps achieve even more energy efficiency, especially large scale and when thinking in terms of urban infrastructure projects, such as cities, railroads and airports.
Think of e.g an airport using energy efficient LED lighting exclusively and achieving a 30% power consumption reduction in comparison with an airport using conventional lighting technology.
Because the long life span of LED lights, also the maintenance work - think of all the work and energy it would take to purchase, stock and change the conventional light bulbs of an airport - you’ll see that you can make significant energy savings also when it comes to maintenance and replacement due to the long operational life times of LED lighting.
3. Ecologically Friendly - LED Lighting Is Much More Eco-Friendly
LED lights are free of toxic chemicals. Most conventional fluorescent lighting bulbs contain a multitude of materials like e.g mercury that are dangerous for the environment.
LED lights contain no toxic materials and are 100% recyclable, and will help you to reduce your carbon footprint by up to a third. The long operational life time span mentioned above means also that one LED light bulb can save material and production of 25 incandescent light bulbs. A big step towards a greener future!
4. Durable Quality - LED Illumination Can Withstand Rough Conditions
LEDs are extremely durable and built with sturdy components that are highly rugged and can withstand even the roughest conditions.
Because LED lights are resistant to shock, vibrations and external impacts, they make great outdoor lighting systems for rough conditions and exposure to weather, wind, rain or even external vandalism, traffic related public exposure and construction or manufacturing sites.
5. Zero UV Emissions - LED Lighting Features Close to No UV Emissions
LED illumination produces little infrared light and close to no UV emissions.
Because of this, LED lighting is highly suitable not only for goods and materials that are sensitive to heat due to the benefit of little radiated heat emission, but also for illumination of UV sensitive objects or materials such a in museums, art galleries, archaeological sites etc.
6. Design Flexibility - LED Lighting Has Powerful Flexible Design Features
LEDs can be combined in any shape to produce highly efficient illumination. Individual LEDs can be dimmed, resulting in a dynamic control of light, color and distribution. Well-designed LED illumination systems can achieve fantastic lighting effects, not only for the eye but also for the mood and the mind:
LED mood illumination is already being used in airplanes, classrooms and many more locations and we can expect to see a lot more LED mood illumination in our daily lives within the next few years.
7. Operational in Extremely Cold or Hot Temperatures
LED are ideal for operation under cold and low outdoor temperature settings. For fluorescent lamps, low temperatures may affect operation and present a challenge, but LED illumination operates well also in cold settings, such as for outdoor winter settings, freezer rooms etc.
8. Light Dispersement - LED Lights Achieve Higher Application Efficiency
LED is designed to focus its light and can be directed to a specific location without the use of an external reflector, achieving a higher application efficiency than conventional lighting. Well-designed LED illumination systems are able to deliver light more efficiently to the desired location.
9. Instant Lighting & Frequent Switching - LEDs Can Be Turned On/Off Many Times
LED lights brighten up immediately and when powered on, which has great advantages for infrastructure projects such as e.g traffic and signal lights.
Also, LED lights can switched off and on frequently and without affecting the LED’s lifetime or light emission. In contrast, traditional lighting may take several seconds to reach full brightness, and frequent on/off switching does drastically reduce operational life expectancy.
10. Low-Voltage - LED Lighting Can Run on Low-Voltage Power Supply
A low-voltage power supply is sufficient for LED illumination. This makes it easy to use LED lighting also in outdoor settings, by connecting an external solar-energy source and is a big advantage when it comes to using LED technology in remote or rural areas.
 

Fluorescent lights can cause harm to our health

Oct 1, 2016
Fluorescent lights can cause harm to our health
Fluorescent lights are a common light source in an office building and shopping markets. With the advent of compact fluorescent lights, they are becoming common place most homes as well. Fluorescent lights are cheap to buy compared to how long they last (about 13 times longer than regular incandescent bulb) and cheap to operate requiring a fraction of the energy incandescent bulbs do. But they can be incredibly bad for you.

The Problems
There have been hundreds of studies done since the last quarter of the last century that has shown causal links between elongated exposure to fluorescent lights and various negative effects. The base of these problems is all based on the quality of light that's emitted.
The theory is basically that we are children of the sun. It is only relatively recently, with the proliferation of electricity, that humankind has taken complete control of the night and interior spaces. Before that most light came from the sun or a flame, and since flames didn't give you that much light you usually woke according to the sun and worked by a window.
There are a number of negative health effects that have been linked to working under fluorescent lights that are theorized to be caused by this body chemistry mechanism such as:
·         Migraines
·         Eye strain
·         Problems sleeping, due to melatonin suppression
·         Symptoms of Seasonal Affective Disorder or depression
·         Endocrine disruption and poor immune systems
·         Female hormonal/menstrual cycle disruption
·         Increases in breast cancer rates and tumour formation
·         Stress/Anxiety, due to cortical suppression
·         Sexual development/maturation disruption
·         Obesity
·         Agoraphobia (anxiety disorder)

 
The other main cause of problems with fluorescent lights is that they flicker. Fluorescent light bulbs contain a gas that gets excited and glows when electricity is passed through this. The electricity is not constant. It is controlled by electric ballast that pulses on and off really fast. To most people, it is so fast that it looks like it is on constantly. However, some people can perceive the flicker even if they can't consciously see it. This can cause:
·         Migraines
·         Headaches
·         Eye strain
·         Stress/Anxiety
Additionally, fluorescent bulbs, especially cheaper bulbs, may have a green cast to them making all the colors in your environment drabber and sickly looking.

The Solutions
If you are forced to work/live beneath fluorescent lights for extended periods of time each day there are a number of things you can do to combat the negative effects. The first is to get out in the sun more. Getting sun exposure, especially for stints in the morning midday and late afternoon, can help maintain your circadian rhythm. Putting in some windows, skylights, or solar tubes to bring sunlight into your interior environment can work as well.
Short of bringing in the sun you can bring in a light source with a fuller spectrum. There are some "full spectrum" and "daylight spectrum" fluorescent lights in the market that have a better color temperature spread than regular fluorescent lights so they do help, but they don't replace sunlight. Alternately you can put a full spectrum light filter over your fluorescent bulb or light fixture lens that alters the light coming out of the fluorescent bulb and gives it a fuller spectrum. These tend to give off more Ultraviolet (UV) rays that may cause skin problems, prematurely age materials like plastic or leather, and cause photos to fade.
Incandescent lights do a decent job of providing a good spectrum of light that most people respond to. Another benefit of incandescent lights is that they are a constant light source that doesn't flicker. If you perceive fluorescent flicker having a single incandescent light bulb on in the room can be enough to cover the flicker and keep it from affecting you. They can also balance out any tint given off by the fluorescent bulb.
In some case phototherapy, or light box therapy, can counteract lack of sunlight exposure. This is a common treatment for Seasonal Affective Disorder and it uses an incredibly bright light for a limited amount of time to help keep your body chemistry regulated.
Optometrists have long prescribed glasses with a very light rose colored tint on them to counteract the effects of working under fluorescent lights, especially in women who are experiencing hormonal problems.
Flicker problems can be improved by using fluorescent light fixtures that use electronic ballasts as opposed to magnetic ones.
 

Some cities are taking another look at LED lighting after AMA warning

Sep 27, 2016
By Michael Ollove September 25
If people are sleepless in Seattle, it may not be only because they have broken hearts.

The American Medical Association issued a warning in June that high-intensity LED streetlights — such as those in Seattle, Los Angeles, New York, Houston and elsewhere — emit unseen blue light that can disturb sleep rhythms and possibly increase the risk of serious health conditions, including cancer and cardiovascular disease. The AMA also cautioned that those light-emitting-diode lights can impair nighttime driving vision.

Similar concerns have been raised over the past few years, but the AMA report adds credence to the issue and is likely to prompt cities and states to reevaluate the intensity of LED lights they install.
 
Nearly 13 percent of area and roadway lighting is now LED, according to a report prepared last year for the Department of Energy, and many communities that haven’t yet made the switch plan to do so. LEDs are up to 50 percent more energy-efficient than the yellow-orange high-pressure sodium lights they typically replace. They last for 15 to 20 years, instead of two to five. And unlike sodium lights, the LEDs spread illumination evenly.

Some cities say the health concerns are not convincing enough to override the benefits of the first-generation bright LED lights that they installed in the past three to eight years. New York is one of them, although it has responded to resident complaints by replacing the high-intensity, white LED bulbs with a lower-
intensity bulb that the AMA considers safe.
 
Scott Thomsen, a spokesman for Seattle City Lights, which is responsible for the city’s exterior illumination, dismissed the health concerns about bright-white LED lights, noting that they emit less of the problematic blue wavelengths than most computers and televisions.
 
After a year and a half of discussion and sampling, Lake Worth, Fla., is replacing its sodium streetlights with about 4,150 LED lights with an amber glow. “We found a color that made sense for the health of our city, and we’re proud of the choice we’ve made,” Michael Bornstein, the city manager, said.

Mark Hartman, Phoenix’s chief sustainability officer, said the city might go with a mix of the intense lights for major intersections and ballpark areas that need very bright light and a softer light for residential areas. He said the city would consider the health arguments, although he, too, mentioned the glow from computers and televisions. “Nobody says don’t watch television or use your computer after 9 p.m. because of blue lights,” he said.
 
The first generation
Almost as soon as outdoor LEDs were made available, the federal government encouraged states and municipalities to use them, calling LEDs highly efficient for such applications as traffic lights and exit signs. But critics say federal authorities were too quick to endorse LEDs.

 
The Department of Energy and the Environmental Protection Agency “put a lot of push into them,” said Michael Siminovitch, director of the California Lighting Technology Center at the University of California at Davis. “I call it a rush.”

Siminovitch said the light from early-generation LEDs “really negatively impacts people’s physiological well-being.”
 
Lighting is measured by color temperature, which is expressed in “kelvin,” or “K.” The original LED streetlights had temperatures of at least 4000K, which produces a bright white light with a high content of unseen blue light.
 
Now, LEDs are available with lower kelvin ratings and roughly the same energy efficiency as those with higher ratings. They don’t emit as much potentially harmful blue light, and they produce a softer, amber hue.
 
When 4000K and 5000K LEDs were installed, they drew mixed responses. Police and traffic-safety officials and many motorists liked them because they created a bright light that sharply illuminated the ground they covered.
 
But in many places, including New York City and Seattle, residents complained that the bright white light was harsh, even lurid. People described them as invasive, cold and unflattering.
 
Even before the AMA warning, some researchers raised health concerns. Some noted that exposure to the blue-rich LED outdoor lights might decrease people’s secretion of the hormone melatonin. Secreted at night, melatonin helps balance the reproductive, thyroid and adrenal hormones and regulates the body’s circadian rhythm of sleeping and waking.
 
“As a species, we weren’t designed to see light at night,” Siminovitch said.

Meanwhile, the “dark sky” movement criticizes LEDs as a major contributor to what it calls the “light pollution” that humans cast into the night sky.
 
Effect on sleep cycles
In its warning, the AMA cited the melatonin issue, noting that studies have linked bright LEDs to reduced sleep time, poor sleep quality and impaired daytime functioning.
 
It referred to evidence that exposure to high-intensity light at night might increase the risk of cancer, diabetes, cardiovascular disease and obesity. And it cautioned that intense LEDs have been associated with “discomfort and disability glare,” which might impair nighttime vision for drivers.
 
Finally, the AMA cautioned about the harmful effects of bright LEDs on wildlife, particularly nocturnal animals, birds and insects.
 
“These lights aren’t just bad for us,” said Mario Motta, one of the authors of the AMA report, “they’re bad for the environment, too.”
 
The AMA did commend LEDs for their energy efficiency and effectiveness, but it urged cities to minimize blue-rich outside lighting and recommended the use of LEDs no brighter than 3000K.
 
Tony Dorsey, a spokesman with the American Association of State Highway and Transportation Officials, said that the organization’s environmental committee is studying the AMA’s report but that association members haven’t seemed concerned about the use of 4000K LEDs on roadways.
 
The Department of Energy said LEDs should be used with “prudence” but praised their overall performance. It said the AMA had added “another influential voice” to the issue.
 
Others, including the Lighting Research Center at Rensselaer Polytechnic Institute in Troy, N.Y., said the lights pose less risk than the AMA suggests. The research center pointed out that the AMA report is based on extended exposure to high-intensity LEDs and said the blue-light hazard of LEDs “is probably not a concern to the majority of the population in most lighting applications.”
 
Motta stood by the AMA’s concerns about high-intensity LEDs and said there is no downside — either in cost or efficiency — to choosing a lower-intensity light.

Sleeping in Seattle
Some cities are satisfied with their higher-intensity LED streetlights.
 
In Seattle, which has installed about 41,000 new lights since 2010, Thomsen, the spokesman for Seattle Light, attributed the early complaints to residents’ surprise at the sharp difference in brightness between the old sodium lights and the new LEDs.
 
[What to order when you’re buying new (and pricey!) eyeglasses]
 
Light from the new fixtures is comparable to moonlight and provides excellent visual acuity for drivers, Thomsen said. Police especially like them, he said, because they enable people to distinguish colors at night. “The police say they get much better witness descriptions,” Thomsen said.
 
Thomsen also noted that even though the Seattle LEDs are rated at 4100K, that is significantly lower than most computer screens, laptops and televisions.
 
But Pete Strasser, technical director at the International Dark-Sky Association, said moonlight contains far less blue light than do high-intensity LED lights.
 
A little more than a year ago, Gloucester, Mass., was on its way to replacing its sodium streetlights with 4000K LEDs. But then city planner Matt Coogan began reading about health and environmental warnings. He also had residents sample the 4000K lights against 3000K models.
 
Next month, the city is expected to finish installing its LEDs, but they will be 3000K rather than 4000K.
 
Coogan knows the debate over the health risks of LEDs rages on. But he doesn’t want to be on the wrong side of history.
 
“I didn’t want to get 10 or 15 years down the road and find out we had exposed our people to a health risk,” Coogan said.

Cost Comparison between LEDs, CFLs and Incandescent light bulbs

Sep 15, 2016
Cost Comparison between LEDs, CFLs and Incandescent light bulbs
 

 
  

- * The posted cost of $35.95 for a 60 watt LED equivalent is on the high end of the scale. These prices are going down.
- Cost of electricity will vary. The figures used above are for comparison only, and are not exact. Residential energy costs among the various states range from 28.53 cents (Hawaii) to 6.34 cents (Idaho) per KWH.
- The cost per bulb for LEDs may vary. We used the figure of $35.95 (for a 60 watt equivalent LED bulb) as an average among lighting retailers.
- Estimates of bulb lifespan are projected, since it would take about 6 years of continuous lighting to test. Some manufacturers claim the new LED bulbs will last up to 25 years under normal household use, but this is not proven.
- Bulb breakage and bulb replacement costs have not been factored into this comparison chart. Incandescent bulbs and CFL bulbs are more easily broken than LEDs, which increases their cost of use.
- Most LEDs come with a minimum 2-year guarantee. Any defective LED bulb will usually fail within this time.
 

Benefits of LED

Sep 15, 2016
Electric lighting burns up to 25% of the average home energy budget.

The electricity used over the lifetime of a single incandescent bulb costs 5 to 10 times the original purchase price of the bulb itself.
Light Emitting Diode (LED) and Compact Fluorescent Lights (CFL) bulbs have revolutionized energy-efficient lighting.
CFLs are simply miniature versions of full-sized fluorescents. They screw into standard lamp sockets, and give off light that looks similar to the common incandescent bulbs - not like the fluorescent lighting we associate with factories and schools.

LEDs are small, very efficient solid bulbs. New LED bulbs are grouped in clusters with diffuser lenses which have broadened the applications for LED use in the home. LED technology is advancing rapidly, with many new bulb styles available. Initially more expensive than CFLs, LEDs bring more value since they last longer. Also, the price of LED bulbs is going down each year as the manufacturing technology continues to improve.
 
LED Lightings
LEDs (Light Emitting Diodes) are solid light bulbs which are extremely energy-efficient. When first developed, LEDs were limited to single-bulb use in applications such as instrument panels, electronics, pen lights and, more recently, strings of indoor and outdoor Christmas lights.
Manufacturers have expanded the application of LEDs by "clustering" the small bulbs. The first clustered bulbs were used for battery powered items such as flashlights and headlamps. Today, LED bulbs are made using as many as 180 bulbs per cluster, and encased in diffuser lenses which spread the light in wider beams. Now available with standard bases which fit common household light fixtures, LEDs are the next generation in home lighting.
 
A significant feature of LEDs is that the light is directional, as opposed to incandescent bulbs which spread the light more spherically. This is an advantage with recessed lighting or under-cabinet lighting, but it is a disadvantage for table lamps. New LED bulb designs address the directional limitation by using diffuser lenses and reflectors to disperse the light more like an incandescent bulb.
 
The high cost of producing LEDs has been a roadblock to widespread use. However, researchers at Purdue University have developed a process for using inexpensive silicon wafers to replace the expensive sapphire-based technology. This promises to bring LEDs into competitive pricing with CFLs and incandescent. LEDs may soon become the standard for most lighting needs. We are following these developments with interest and will report the latest updates in this research.
 
 
 
 
Benefits of LED Light Bulb

Long-lasting - LED bulbs last up to 10 times as long as compact fluorescents, and far longer than typical incandescent.
Durable - since LEDs do not have a filament, they are not damaged under circumstances when a regular incandescent bulb would be broken. Because they are solid, LED bulbs hold up well to jarring and bumping.
Cool - these bulbs do not cause heat build-up; LEDs produce 3.4 btu's/hour, compared to 85 for incandescent bulbs. Common incandescent bulbs get hot and contribute to heat build-up in a room. LEDs prevent this heat build-up, thereby helping to reduce air conditioning costs in the home.
Mercury-free - no mercury is used in the manufacturing of LEDs.
More efficient - LED light bulbs use only 2-17 watts of electricity (1/3rd to 1/30th of Incandescent or CFL). LED bulbs used in fixtures inside the home save electricity, remain cool and save money on replacement costs since LED bulbs last so long. Small LED flashlight bulbs will extend battery life 10 to 15 times longer than with incandescent bulbs. 
Cost-effective - although LEDs are initially expensive, the cost is recouped over time and in battery savings. LED bulb use was first adopted commercially, where maintenance and replacement costs are expensive. But the cost of new LED bulbs has gone down considerably in the last few years, and are continuing to go down. Today, there are many new LED light bulbs for use in the home, and the cost is becoming less of an issue.
Light for remote areas and portable generators - because of the low power requirement for LEDs, using solar panels becomes more practical and less expensive than running an electric line or using a generator for lighting in remote or off-grid areas. LED light bulbs are also ideal for use with small portable generators which homeowners use for backup power in emergencies.
 

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