home depot or lowes

Thanks - i am tempted to go today!

You can buy a timer that you program the on and off times. I got one on sale at Menard for less than two dollars works great.

I also saw a remote control light at Lowe's for $39. I has a key fob type remote that transmits up to 100 ft. I am thinking about this one for my GH.

You might want to consider that the flowering cycle and growth of many plants is affected by the length of the night. Artificial lighting will affect that, and if you have your lights controlled by a light sensor, they will be on all night. I'd go with a timer or manual control instead of a light sensor.

I bought ours at Home Depot. It was only $10!

It's programmable. I have it set that when dusk comes, it turns on the lights for 5 hours. It can be set to many different lengths of time.

It just plugs in the wall outlet and you plug a lamp or whatever into it. I have 2 of those compact flourec. One on each end of the GH.

Works great, doesn't suck lots of power at all.
The other upside, is that unlike a manual timer that you have to set an on/off time and daylight changes, this one automatically adjusts with the changes in nightfall.

Oh, and it's an outdoor type, so it won't get wet inside.

It's identical to this one at Radio Shack.

http://www.radioshack.com/sm-intermatic-outdoor-digital-timer--pi-2146464.html

I bought an Intermatic HB35R at Menards for $8.87. Available on-line for about $10. It has a 10A capacity and allows two on-off cycles (more if you buy more presets). It has a short three wire plug and three wire outlet, too.

Here is a link that might be useful: HB35R