Nice work.
Just a suggestion: Although the bulbs are floods, they do have reflectors. As a result, heat will be focused directly above. this will also add to the direct convection heat from the bulbs. The white interior will help to even out the heat a little, but may not be enough to eliminate hot spots.
1. Try changing to non-reflectorized bulbs.
2. Try putting a small fan inside to circulate. BTW, the electricity of operating the fan is not wasted. All the watts in operating the fan is completely converted into heat inside the box.
dcarch
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