I'm responding to this thread first although I did later on.
Why sealed room/s?
The root of your problem is non air cooled reflectors ------doesn't mean you can't keep a sealed room------you just pull air from outside the room through the light chain and out.
the other option is to install a large ac unit-----I think it was
@Carolina Dream'n that suggested 6k btu per 1k flowering in a sealed room.
Is your room insulated?
A~~~