White light from LED Message Board

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Technology Stocks : White light from LED

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To: kinkblot who wrote (323)	8/26/2000 6:14:47 PM
From: John Finley	Read Replies (1) of 565

Re: light intensity I need to look up luminous intensity as perceived by the eye. One would think that a photon in your eye is a photon in your eye <g>. Maybe the spread spectrum of the incandescent (albeit filtered) has something to do with it. You're probably right about the filtering removing the other 2/3, though. Reading all the hoopla about the white LEDs I guess I thought that they were more efficient than fluorescents. I guess that is why CREE is doing so well with a high thermally conductive substrate. If white LEDs are only 10% efficient, you'd have to remove the other 90% in heat. On second thought, I don't buy that! Being the empiricist that I am I've run my white LED flashlight and a comparably bright incandescent and I can say that the incandescent generates considerably more heat. But alas, it may come down to human perception again. The incandescent operates at a much higher temperature, so maybe I PERCEIVE it as dissipating more heat..... Where's a calorimeter when I need one <g>. Oh well.... JF

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