I'm looking for a way to know whether certain lights are on. These are ones that can not be controlled by Lutron, for various reasons (old buildings, outdoor lights on dusk/dawn sensors). The ideal (and maybe only) solution that I can think of is a light bulb socket coupler that transmits when it has current. In a scenario like that, I could work on how to make it talk to my Crestron system.
Is anyone familiar with anything like this...or another retrofit-style to detect whether a specific bulb is on?