No its not vented, and the outside metal does get pretty hott, it was designed to be an outside security light. I think i would rather keep the heat inside the fixture if the bulb life is not affected too much, how much is drastically?
I recently got a 400W metal halide security light Its encased in a brown metal cover which keeps in alot of heat, I was wondering if i should remove the glass cover over the bulb. It keeps in alot of heat, but does it block any light?