To try and answer your question's I would need more info .......how many plants are going to be growing? what strain are they? Have you checked out different methods of training.....SCROG, SOG, LST, Topping, fimming? Why are your temps in the 90's? Poor venting? MJ likes to stay 70 and 75 for optimal results. I'm no expert but I've read a lot of great info on this site........You should do the same.

I used to use CFL's and my temps got to about 81.....I switched to a single 150hps (for one plant).....after switch temps now stay at 75. I use a heavy duty timer from Home Depot and haven't had any issues.

Good luck....:jointsmile: