I am looking for a device that will provide a dry contact closure when a photo cell detects darkness. Use is for a home automation system to control my landscape lighting. I know I could build a circuit with a 120 volt photocell and a 120 volt relay but I am trying to simplify the circuit with a single device. If the circuit needs power, ideally it would use a 9 volt battery.
Any one with an idea? Thanks for any help you can provide.
My electrical answers are based on 2014 NEC, you may have local amendments.