Wednesday, July 26, 2006

Super Efficient Lighting

source: http://sustainabledesignupdate.com/?p=31

LED Throwies - www.instructables.com

L.E.D. Lights - Photo www.instructables.com

I am a big fan of LED lighting. LEDs are simply solid state lighting on a chip. The potential efficiency for LEDs is very high and the color quality is potentially unlimited. Current LED technology is such that a single LED makes light at one wavelength. Red LEDs are commonly used in such applications as traffic signals and automobile tail lights. As the technology has developed more colors have been introduced to the market. A recent development is the white LED. White LEDs are made up of a blue LED plus special coatings that convert blue light to other colors in the spectrum. The final quality of the light is dependent on the quality of the phosphors. A second way to make white light is to have a variety of color LEDs that blend together to make white light.

Recently the efficiency of LEDs has greatly surpassed other forms of electric light. An article in EETimes:

L.E.D. Lights - Photo www.instructables.com

I am a big fan of LED lighting. LEDs are simply solid state lighting on a chip. The potential efficiency for LEDs is very high and the color quality is potentially unlimited. Current LED technology is such that a single LED makes light at one wavelength. Red LEDs are becomming common in such applications as traffic signals and automobile tail lights. As the technology has developed more colors have been introduced to the market. A recent development is the white LED. White LEDs are made up of a blue LED plus special coatings that convert blue light to other colors in the spectrum. The final quality of the light is dependent on the quality of the phosphors.

A second way to make white light is to have a variety of color LEDs that blend together to make white light.

Recently the efficiency of LEDs has greatly surpassed other forms of electric light. An article in EETimes:

Cree white LED produces 131 lumens per watt

Spencer Chin

EE Times

(06/20/2006 5:28 PM EDT)

MANHASSET, N.Y. — Cree Inc. said it has produced a white LED with efficiency of 131 lumens per watt, confirmed by the National Institute of Standards and Technology.

“This is the highest level of efficacy that has been publicly reported for a white LED and raises the bar for the LED industry,” said Scott Schwab, Cree general manager, LED chips, in a statement.

Semiconductor suppliers have racing to produce higher efficiency white LEDs as the industry seeks energy-efficient alternatives to conventional lighting. In March, Japan-based Nichia Corp. reported it had developed a white LED rated 100 lumens per watt.

Last September, Cree (Durham, N.C.) said its white XLamp 7090 Power LED was capable of producing 86 lumens per watt.

Lumens-per-watt is the standard used by the lighting industry to measure the conversion of electrical energy to light. As a reference, conventional incandescent light bulbs are typically in the 10 to 20 lumens per watt range, while compact fluorescent lamps range from 50 to 60 lumens per watt.

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