On Nov 11, 2004, at 1:41 AM, Michael Rigby-Jones wrote:

>> Or the Luxeon LEDs at 600+ cd

> The really silly power ones tend to be blue/turquoise/white.  Not sure 
> if
> they have made other colours with that kind of output yet.

The 600cd figure I quoted was for a RED (no phosphor involved, as far as
I know) emitter.  625nm.

It's within the realm of possible.  Mediocre 20mA 5mm red LEDS emit 
5000mcd
(5cd) or more, and 350mA is 17 times more power, so even a straight 
scale
up would give you about a 90cd part.  The Luxeons are NOT "mediocre 
scale-ups",
so 600cd seems possible.

It IS interesting from a technical point of view, that a good part of 
"luxeon technology" is improved packaging and heat dissipation, so that 
a single
LED chip can HAVE 350mA to an 1.5+A run through it without burning up.

BillW

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