04-25-2012, 07:35 AM
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There is no 'watts per gallon rule', that dosen't even work with fluorescents.
Unless they give some indication of the color spectrum (the kelvin rating) there isn't really much you can know. You can try googling your fixture for a "PAR" reading if someone else happened to test it. That could give you an idea. The amount of lumens might also give some kind of an indication. Lumens will tell you how much total light energy there is, but PAR tells you how much is useful for plants (plants only use a specific range of wavelengths).
But, yes, LEDs can come in a light spectrum like 6700K. I personally built my own fixture which uses 5665K LEDs.
I've no idea how they compare to fluorescents other than my plants grow great under them. In terms of lumens, my LED fixture is equivalent to a dual T8 fixture. That is, mine gives off 1400 lumens.
Last edited by Geomancer; 04-25-2012 at 07:36 AM..