ok...let me guess...10 gallon setup from walmart, right? First off, those aren't the kind of lights you need. You need a special kind of bulb, a bulb that produces 5% UVB light. These are only available in flourescent tubes I believe, although I could be wrong. The UVB aids in their digestion. Here's the bad part...if the fixture you have is the screw in type of light bulb (incandescant) you probably will need to buy a new light hood...along with the bulb (and the bulb runs around $35). If you go to a local pet store they usually have reptile lighting kits with a 5.0 UVB bulb (if it's marketed for an iguana that's fine too, they both have bulbs that produce 5.0 UVB.) These kits usually run about $45, include the bulb, fixture, and a screen top. And here's another thing about this...If you have a piece of glass under your light, when you put that UVB in there, you have to remove the glass. Glass, plexiglass, lexan, acrylics, they all block UVA and UVB lights. the only clear medium which I know of that doesnt is pure quartz. And i'll tell you with the price of quartz, no manufacturer is making it out of that. But anyway back to the timer, you just plug the timer into the wall then plug the fixture into the timer. Very simple. Hope this helps. -Chris