i've got a total of 650 watts in my closet, no outlets...
400w HPS, 150w HPS, and 100w T5 up top ...partitioned so i have flower and veg at the same time. works fine as long as i keep the door cracked and a oscillating fan up top and another blowing in...starts to heat up in the summer but i'm in a spot that gets pretty warm in the summer. you should be able to do it relatively easily