well its 45 outside, box has been put outside but now only a temp of 60 inside box?
inside too warm, outside too cool.... haven't got space for more vents/circulation. a good idea would be venting the bulb directly as you said - something like a cooling tube, idk.
either way, leaving it outside as 60 is better than 100.
already ordered and swapping out my 2x 250cfls for a 1 400w HPS bulb which comes with tent, ballast, reflector, carbon filter and inline fan. 180cmx100cmx100cm.
Should increase the temps a little for such a cold grow room.
Not sure how the tent will effect the heat, either way, can take it back inside if it gets to cold... cant imagine that will happen with the hps bulb.