Hey Weedhound,

The basic theory is that plants, marijuana in particular, use certain wavelengths(mainly blues & reds) of light to perform photosynthesis much more than others(greens and yellows). Typical hid lights seem to have lots of yellows and greens and levels down at the ends of the spectrum where the blues and reds are. I realize all bulbs are different so some will have more than others. So led growing is really trying to get the same yields/growth from nominal hids in order to drop many risk and cost factors (much less power, almost no heat). again thats what we believe is the basics...while blazed.

Here's a much more scientific explanation.
http://growled.se/docs/Growled_brochure_oct.pdf
Don't worry about the ad read from page 3 on. But the lights in the procyon are far more developed than in this brochure.

Yes we spent $1800, but IF they work for half of their projected lifespan the costs of bulb & ballast replacement, power for lights and cooling in hid will be far more economical. And it is really for research purposes, if people do the same thing over and over then the field as a whole stops evolving.

Thanks for your interest,
Doughboy
SnSstealth