tech article - LED droop

[jerry i h]

http://spectrum.ieee.org/semiconductors/optoelectronics/the-leds-dark-secret/0
http://www.scribd.com/doc/21615915/IEEE-Spectrum-Magazine-August-2009

The droop in the article is not about the sag in lumens from a poorly heat-sinked Lux. CFL has efficiency of 100 lm/watt, LED is 250, but only at low power levels. Crank up the power, and the efficiency droops to only 100. The article reviews current research into this. They say that LED should be capable of 300. So, a 7 watt LED at 300 lm/watt will give the same light as a 100 watt incan, as opposed to the 23 watts required by CFL. I found the article to be quite interesting.

 

[Illum]

led efficiency has always been the highest in low current applications, why do many expect that efficiency value to apply at a higher current?

If this was taking place as the light in your fridge maybe...but not in a Tj = 25C setting

 

[saabluster]

Pretty sure this was already posted. I will have to go find it.

 

[Illum]

or wait for Marduke, he is usually quite punctual :thinking:

 

[jerry i h]

Pretty sure this was already posted. I will have to go find it.

Yup:
http://www.candlepowerforums.com/vb/showthread.php?t=239096

Late to the party again. :shakehead
Still, it is an interesting article. Too bad it won't happen anytime soon.

 

[saabluster]

Yup:
http://www.candlepowerforums.com/vb/showthread.php?t=239096

Late to the party again. :shakehead
Still, it is an interesting article. Too bad it won't happen anytime soon.

Ah yes. Thats the one. Thanks for hunting it down.