Hello B like Turtle says it sounds like you need some air in there to cool things down a little, the lights do put out a lot of heat so some ventilation is required.
Where do you live B ? because I'm having to opposite problem at the moment, it's too cold.

Mind you my idea of ventilation when it gets too hot in the summer is to open the growroom door, so my knowledge of how to keep a small closet grow cool is none exsistent
However rather than go down in watts on the lamp I would definietely try to get some air in there.

Sorry I can't tell you more


love mand xxx