Light2D detect when body enters light

I'm trying to figure out how to set up a Light2D so that when a body enters into the light it will emit a signal

but when a static body casts a shadow, I want the area in the shadow to not emit the signal

I figure I would use Area2D for body detection, but I'm not sure where to go from there.

Any ideas/help?

Area2D sounds like the right choice. Setup its collision mask/layers to detect only those bodies that you want to detect.