Help with wave affecting lights

Hello !
I need some help with a short film me and my team are working on.
At some point in the movie, a character enters a space with a lot off little light sources that light up evenly like a circle from a source. I was wondering if there was a way for exemple to make the light turn on when they touch a spehere, so that i can just scale the sphere from the source and have all the light turn on and form a circle shape that grows.
I don’t know if i’m really being clear but i have no idea how to do that in blender.
Thanks in advance :smiley: