Yeah it is where you run the 12 hours on then 5 1/2 hours off , then 1 hour on , 5 1/2 hours off. I believe outdoor growers in warmer climates came up with. They put their plants outside while it is still winter and would light up lanterns in the middle of the night for a hour to keep them from going into flower. Thats all it really does it keeps the plants in veg.