Thats a neat lookin grow box you got there, I like it a lot

I couldn't help with the HID lighting Q's as I haven't used one yet but the flouros could do ya some good, HID would be better if heat was controlled.

Im currently using fluoros and had CFL's running too before scrog. I'm having pretty good luck with my girls now and a couple clones are coming in nicely after a few weeks in veg under fluoros. The other two are a month into flower and their producing more than I expected but not near as much as I've seen from peeps using HID.

Thinking bout the heat my bulb put out into my growbox I'd say fluoros would deff be a smart move heat wise, without upping your ventilation. IMO using HID would prob be fine if you moved the bottom fan up top, flipped it to exhaust and just used the bottom hole as a passive intake. That would move a bit more air.

Im using Philips T8 4' tubes. Veg @ 6500k and flower @ 2700k. T5s are better but cost a good diff more than a T8 fixture. I have two double bulb 4' fixtures that I got for $13 each at wally world and the Philips tubes came from home depot, they ran $30 total for four veg bulbs, then another $30 for the four flowering bulbs. The CFLs I got at HD too, they cost about $10 for a four pack.

EDIT: If I had that box and light I'd run some 2' fluoros up the sides and use those and the LED come flowering.