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A lot of it depends on the "grow lights" you are using. The indoor marijuana farmers that use bunches of metal halide H.I.D. fixtures consume lots of kilowatt hours.

If you just use fixtures that use F40T12 tubes (actually 34 watts per tube these days), you shouldn't use much, unless you REALLY get into the indoor growing.

By the way, don't waste money buying the so-called "grow" lamps. General Electric calls them F40T12GRO, in the common 48 inch bi-pin size.

Just use a standard "cool white" phosphor lamp. Same results with a lot less cost. G.E. would be F40T12CW/RS/WM

Bob (General Electric "Master of Light")
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