Why Are 488nm LED Options Hard to Find for Cell Sorting?

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SupaVillain
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Why can't I find any LED's at 488nm? I am trying to find a cheaper light source than the traditional argon ion laser for a possible fluorescence activated cell sorter. See link below for schematic. Does anybody know a good retail site for lights in this spectrum I can't find good results with google.

http://thebigone.stanford.edu/papers/Fu%20nature%20america.pdf
 
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SupaVillain said:
Why can't I find any LED's at 488nm? I am trying to find a cheaper light source than the traditional argon ion laser for a possible fluorescence activated cell sorter. See link below for schematic. Does anybody know a good retail site for lights in this spectrum I can't find good results with google.

http://thebigone.stanford.edu/papers/Fu%20nature%20america.pdf
How well focused does it have to be? That is, if it has a significant amount at 488 is it OK for it to have quite a bit in the surrounding region of the spectrum and if so, how far away from 488 is OK? There are inexpensive LED sources that show a range that includes 488.
 
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I have no idea, i mean i bet i can filter out the unwanted parts of the spectrum anyways but really I think for biofluorescence it shouldn't take much power. When i think of a laser and high power, all that does is burn whatever it's pointed at. Not trying to burn the cultures. I would much rather try out the cheap version than spend a bunch of money on something i don't really need. Can you link me what you see at 488?
 
Hm ... I was thinking UV spectrum at 388, not visible at 488. I can't see why you would want 488 if what you are looking for is fluorescence. To get 488 just buy a $4 "black light" bulb at a hardware store (but I don't think you'll get any fluorescence off of what you shine it on; at least I know that's true of wood)