Anybody controlling lights with photocell?

[smokinjoe1952]

I have a grow chamber that utilizes 2 48" LED light strips. The lights are on a battery backed-up timer. The set-up has been running for close to 3 years. I try to adjust the on-off times to "somewhat" match the seasons as this seems important to the Cattleya's and probably the other plants to to some degree. Naturally, I am fairly lax about resetting my timer, which maybe gets done 2-3 times a year.

It seems that ideally, a photocell device that simply turns ON the lights when DAYLIGHT is detected, and OFF when DUSK is detected would be ideal.

Does anybody know if something like that exists? Has anybody designed something like that? I. E. Photocell to AC relay arrangement.

Thanks,
Joe