lol, FAIL and a half. 18/6 and any other lighting pattern besides "photo periodic light" or also called " gas lantern"...dumbasses run high electric bills on 24 hours or 18, when i run my lights in a pattern and cut my bill down by 60%..yes..60%. and i yield more..20% more to be exact. to do this.. 12 hours ON, 6.5 hours OFF, then 1 hour ON, 6.5 off. this stunts the plants chemicals from flowering with the 1 hour light on inbetween, cuts energy, doesnt stress plants, and makes and saves you a TON, if you dont do this, you are a moron who likes to shell out needless money.