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Lighting a 4'x4' on that budget I'd go with a 1000w on a parabolic or wide wing reflector, or a 600w on the more efficient end. Heat could be an issue(always my problem with hps)
For the mars leds, 5 x 300w(140w actual) would spread out pretty nicely over a 4'x4'. Basically one light per 2'x2' corner and another in the center.
For the mars leds, 5 x 300w(140w actual) would spread out pretty nicely over a 4'x4'. Basically one light per 2'x2' corner and another in the center.