White light from LED Message Board

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Technology Stocks : White light from LED

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To: kinkblot who wrote (311)	8/25/2000 5:13:20 PM
From: John Finley	Read Replies (2) of 565

I'm having a hard time with the numbers in the article: A red LED traffic light uses only 15 watts of electricity instead of the 150 watts consumed by traditional stoplights. but.... About 90 percent of the electrons that enter the [AlInGaP ] diode generate photons <snip> only 30 percent of them emerge as visible light. So this means that the red LEDs are .9 X .3 = 27% efficient instead of the 8% efficiency of the incandescents. That's three times as efficient. But they use 1/10 as much power in a stoplight? That means the red LEDs are roughly 3 times dimmer. They don't LOOK 3 times dimmer. Hmmmm.... JF

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