I would guess no, but never tried it.... The 12 hours of darkness is really important. Keep in mind that the general over simplified idea is to mimic nature that has evolved over hundreds of thousands of years. I would think the basic genetics might get confused. I have heard of a system that always has 12 hours off but they use a bell curve of light hours from 8 to 12 hours throughout the 8+ week cycle. Why would you want to do this?