I have been breeding ASF's for a few years now and I keep all my racks in my insulated shed with a window unit A/C through the wall and an oil heater in the winter. I installed a light with a switch in the shed, but the only time it gets turned on is in the evening when my wife goes out to feed them or clean them and that is it. I have four racks six tubs high and one rack with eight tubs. All of them produce like crazy. I keep all 21 of my snakes fed including babies and the local pet store in stock.

The insulated part of the shed is sealed tight (no light at all comes in). I hope this clears it up for you. They dont need a light cycle at all to be healthy and breed, good luck.