You could go with a single 14-20K 250w Single Ended Metal halide.
You could keep anything under it, and bulb replacement cost is cheap that way.
A SE bulb covers 2ft preferably, but a 250 will be plenty of light, just don't keep any high light corals on the end 6 inches. I ran a 20K XM 250w over my 36x18x18 tank for a while and it looked good. It did look better with a 10K supplimented with VHO actinics though.
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