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I have a question. The general rule is 2-4 watts per gal, but which watts?
I have seen CF lamps that state, 27 watts = to 150 watts. So which do you
follow and why?
I went to see a MHD light today and the amount of light that a 70 watt unit
puts out is very impressive. Seems alot more then 2 x 40 watt tubes, so
which would be better? Also the color temp of these units I saw are 5200K.
Is this bright enough for high light plants?