ok well my closet is 6x2x6 and im using a 600 watt. i know for sure with a clearance that small a 1000 would be hard but thats my noob opioin. to give u an idea of the heat my closet is 90 with an air cooled reflector. i had to buy a $300 AC unit to keep the temps down. so be prepared for the heat. test them out and record the temp.