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Metal Halide

    Good evening! I was curious; is there a vast difference between metal
halide bulbs other than the wattage? I guess what I want to know is if there
is a "wrong" metal halide to buy. And, most people say that to have a
successful planted tank you need to have at least 2 watts/gallon. However,
the lumens that a metal halide produces is at least 4 times the amount of
any incandescent or fluorescent bulb. So, does the same 2 watts/gallon still
have to be adhered to? Thanks.