I have the same prob right now too. in the south USA its about 80 degree inside my grow room and outside is about 95 degrees. I was using 2-150's but wasnt enough light so i put up a 400 and the closet temp is 81-83 degrees. The plants are skinny but covered with budz, small though because of the heat so you will still get a decent amount I believe just not fat dense budz. Im gonna wait till the end of summer for the next crop because its only going to get hotter for me donw here...looks good bro..my pics are on the thread 2-150 hps closet grow in new mexico...peace ollie