i have a damn near exact same setup(attic). The flouro's will be fine (low heat output) Altough i use t5's and they work great. The only problem i have with the 1000 watter is that it runs hotter than shit. Cooling is going to be your biggest issue. A 1000 watt hps will light a 10x10 room enough to grow, and putting in a much smaller space just concentrates the heat and light. All i can say is watch your temps, because thats the biggest problem with me.