We run ours very long then... the 210g T5 lights are on 10am-11pm and the 2 250 Halides are on from 4-9pm. The 20g has LEDs and runs from 3-11pm. The 140g runs from 12-11pm, with the actinic on all day and the whites 3-9pm. We also have the fuge lights on 24 x 7.