Try getting a timer, their cheap, that way when you are out late getting drunk on weekends you won't have to worry about the lights getting turned off for bedtime for your cham.
Also it is better to have the lights mimic the sun kind of, if the cham is in a room with a window he will want to get up when it starts getting light out, at least mine does, and mine goes to bed when it gets dark out, which is about 30 mins before my timer goes off.