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First off, welcome to growing and good luck.
One, I don't think your gas water heater will be a problem at all. It may even produce some CO2 which would be beneficial.
White Poly works great to line walls, styrofoam panels, or even mylar emergency blankets are also an option.
I think in your situation (long/narrow space) you'd be better off with multiple lights. i.e. 3 400 watters or 3 600 watters. I think you'd get a more efficient use of light and space that way.
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Perhaps, if I am very lucky, the feeble efforts of my lifetime will someday be noticed, and maybe, in some small way, they will be acknowledged as the greatest works of genius ever created by Man.
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