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Technology Stocks : White light from LED
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To: semi_infinite who wrote (186)2/25/2000 11:42:00 PM
From: mauser96  Read Replies (1) of 565
 
I too have serious doubts about the brightness of Cree white LED. As far as I can determine in applications where brightness is of primary importance (flashlights) the LED are almost entirely Nichia . I have seen one with a noticeable lower white light output but don't know who made it. There are various ways to measure brightness, most not originally designed for LED, so this does allow a little wiggle room. Also to most eyes a more concentrated beam looks brighter than a diffuse one. Nevertheless, I consider Cree management remarks on this subject may be disingenuous, especially since the company has refused to send or sell me samples I can test.
The brightness is mainly due to the GaN layer, so maybe Cree has put less work into this than the SiC substrate. The brightness gap probably has not been closed.
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