As I only have 1 250watt halide with two 95 vho on the 36' tank compared to having 2 250's and 2 110 vho for a 4 foot tank. I think the 3 ft wins on cost there. To buy and to run.
It really depends on the final go. If your leaning to a sps tank, dual halides would be needed in any case. If the lean is towards the fish route, a work horse 7 will run 4 40w NO just fine on a 4 ft.
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