My son is into reef aquariums and we have been talking a lot about it. While swimming (he he) through a site I happened across this thread:
LED Array for a Pico - Nano-Reef.com Forums
Now, it is a VERY long thread, but these guys are really making some headway with LED lighting for corals. Maybe there is some information that would benefit orchid lighting?
Here is another site that might have some information:
Notes on LEDs




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