Separate Lunar light w/ timer?

I have my lights connected to a light timer which is on a 12 hour rotation, and I want to add lunar lights to the tank. I was wondering if there's one that has a built in timer? If I have to, I'll buy another box timer, but they take up loads of space, and I'll have to calibrate both so that one cuts off and the other cuts on (hopefully) seamlessly.

I've googled the crap out of these, and not having much luck. It's a 20 gallon nano-reef setup.