[Stoves] Fast Growing Fuel

[steve]

> Dear Steve
> 
> What is the spectral distribution of the light from Red,
> White and Blue  LED's?

It depends on the manufacturer to some extent, and their
particular process and chemistry, but for example Luxeon III
Leds
White have a colour temperature (typical) of 5500 K, maxis
10,000 K !, down to 4500 K
Blue Minimum 460nm  typical 470nm maximum 490nm (25nm half
bandwidth)
Red Minimum 620.5nm typical 627nm maximum 645nm (20nm half
bandwidth)

As you can see pure colours are spectrally very pure, and in
lumen/watt terms MUCH more efficient than White.

I suggest you look at a typical datasheet like.
http://www.luxeon.com/pdfs/DS45.PDF
and particularly figure 1a and 1b

Luxeon sell in "lumens per dollar" rather than "Lumens per
watt" - I suggest you look at folks like Cree for Lm/W
figures

Don't forget too that the electronics todrive the LED makes
a huge difference to overall efficiency too.

Steve