Hi, all,
I'm building a multispectral sensor for food quality assurance for a large vendor. It has to work over a really large range of absorbance, at least 3 orders of magnitude. Red and green channels are not a huge problem, but the ones in between, like 570-580, are turning out to be much harder.
The thing is, the primary-colour LEDs are roughly 50 to 200 times more efficient than the yellow ones I've found, so that I get at most 200 microwatts of total output at 20 mA in the yellow, versus 8-10 mW from red, green, or blue ones.
The best yellow-green one so far is the Avago HSME-A100, which still has a wall plug efficiency of less than 0.5%. I could really use 20 to 500 mW from, say, 10 LEDs.
Does anybody make high power LEDs in the 570 to 580 nm range?
Thanks
Phil Hobbs
(To denizens of both SED and sci.optics: sorry for the mistyped cross-post!)