| | Re: Wooden Canopy over High Lighting?
Hold your hand above the light unit, try several places. Find the hottest place.
Put the wooden cover no closer to the unit than where you can safely hold your hand for a long time.
If you can make it look right you might mount the fans in the ends. Makes a straighter flow of air, might work better.
There is special paint for warm surfaces. I think it is designed for houses with a heater in the wall. The nearest walls where the hot air from the heater hits them can get pretty warm. Look into this sort of paint, especially for the inside of the hood.
I am not sure that any particular type of wood is better than any other for this. I would avoid any composite material such as particle board, masonite or interior plywood. Exterior plywood, well painted could work.