I have the system on a regulated timer, however I would still leave the lighting system off completely if its not going to hurt too much. I leave my halides on for weekend trips, but two weeks without keeping an eye on them almost is a hazard not only to my tank but to my home.
Here's to swimmin with bowlegged women.
Reef with 30G Sump/Fuge Combo
-30G LTAnemonarium with mated porcelain crabs, 10 sexy shrimp, and 2 pink skunks all tied into the other 135G in my system.