call your local electron shop and ask for the latest version of the omron h3cr-f8, they don't make the omrons anymore but they have a nice digital replacement that should be better, I have a bunch on order. I would give you a part number and a link but my local guy gets his stuff out the back door and has only store numbers and not part numbers to discourage guys from shopping around. But the omron lead is all you really need. It is an on off timer you can adjust the on and the off times, that goes to a 5 amp relay. I got mine feeding off my big light timer that is set to 12 12, I set mine to 11 hours off 2 hours on. it stays off for the first 11 hours of day then comes on with what ever is left of the day