It would be doable if the closet door were left open, and in addition to your oscillating fan you had a small fan blowing straight up at the light, and one blowing the heat from the light out the closet. Can't you vent into the attic or something? Otherwise I probably would go with 250 watt, then it wouldn't be such a big problem. That would be a nice size for that set-up, I think, but you still would need some good fans.