I'm looking to grow in a cold cellar space that would need to be heated to keep the root zones warm. I am thinking of running Autos solely for this reason as I think I can run the lights 24/7 to warm the space. Electricity is fairly cheap and the HPS light will provide plenty of heat. I'm curious if I may have trouble with some strains not flowering or somehow the lack of "sleep time" everyday may hurt them? I'm not to worried about the electricity cost for the 500w I will be using constantly. Any negatives to a setup like this?