I'll certainly be checking for mold, especially as it can get quite humid in my box when its hot outside. Thanks for the tip.

Ventilation is 2 pc fans drawing in air at base of grow box, a 6 inch oscilating fan that's blowing air around the top (mostly over the bulb) and another pc fan blowing air outwards above/behind the reflector.

Seems to be working ok for now, just hoping there's no extreme heat coming.