tex...i had halides in my wood canapy...i asked around and it was recommened that paint the inside for better light reflection.....I did not use any metal reflectors ....lets just say i was lucky i didnt burn the house down, the wood above the lights got pretty chared so i would do as JimD recomments and put some space between the wood and reflectors and as far as cooling the canapy mount your fans as close to your lights so that they draw the heat from the lights.....