Again, you’re not going to find anything pre made here, just the parts to do it yourself.
Might be easier to use a reed switch as your sensor and a magnet on the device you want to activate the leds.
Sparkfun has Reed switches if you do a search. A Reed switch might not be able to handle the current yor leds need, if that’s the case have the Reed switch turn on a relay and the relay can turn on the leds.