i have one 400w HPS light in a closet thats 7 feet long, 2 feet wide and about 15 feet tall, wood floors and white drywalls. the reflector hood is 24 inches long and 11 inches wide, the ballast is on the outside of the closet and i have 2 fans in the closet as well. what are the chances of a fire??
Um, moderate? It all depends on how careful you are with the wiring, ventilation and everything else. Don't overload your outlets and don't keep things in a cramped space. Keep your ventilation up. Don't have anything highly flammable in the area. If you're really worried you could buy some flame-retardent blankets to line the walls or something. Now if your bulb happens to fall/break, then the chances go through the roof. You have a lot of space to work with so a 400w shouldn't cause too many issues. Just keep it smart, and consult an electrician if you need to (asking how many watts per outlet, what's too much, etc....don't give details!)