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I know there are many different kind of grow lights and that some of them are relatively efficient. But if I'm correct then blue and red fluorescents will be the most efficient grow lights, even more so than white fluoros, CFLs, and LEDs. (LED grow lights might be comparably efficient but they will be much more expensive.)
My information is based on spectral evidence (no pun intended), so it's only theoretical, but I will definitely try a red-blue fluoro grow as soon as I have the opportunity. I don't believe you should have to use 400W of energy to light a few plants, and I don't think you should have to buy expensive mh, hps, or LED lights for a good grow. This should actually work better than all those and it should be more efficient and less costly.
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