Maybe I should build an led grow light? Anyone know any good methods?
You could do two Cree CXA 3070 modules. The way I would do it, is run each @ 37v x 1.4amps = 52 watts. About $65 or so for each module. Then you can add some reflectors from LEDIL.
Otherwise, LED's for such a small setup will struggle to penetrate @3'. Hell anything will, those Kessil are nice, but 36w's will yield you just over an ounce from six plants 1gm/w, if you can do better, why are you on here
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A small HPS needs crazy amounts of venting, CFL's would be a waste of time and effort for that amount of penetration but a DIY led setup could give you the most potential and one of the more cheaper, but powerful and tried and true methods.
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Especially with lenses for added penetration. Efficiency, less heat and PAR, tough to beat that combo.
I have a cab that is roughly about the same dimensions and I only use about half of it with LED's because I always LST in a scrog style. It's just not worth any light source to penetrate 3 feet with such a small footprint. Shit gets in the way. Comes out lovely as a 70w LED grow though.