I have nice ceiling lighting in a room, in 2’ by 4’ fluorescent drop ceiling fixtures retrofitted to LEDs. But I have large low shelves over workbenches that cast a bit of shadow and want to add lighting under those, such as 2’ long LED strip units.
How can I make these come on and off when the main ceiling lights are turned on and off? I’m not sure it would be practical to add an outlet that is switched by the lighting circuit. I wish there was something like a photocell light control, but one which worked in the reverse sense relative to what people use for automatic outdoor lighting. I want the control to go on when it sees light, and off when it doesn’t. Of course I would place it somewhere the big ceiling lights illuminated brightly and the new under shelf lights hardly at all.