Hello and welcome to BYC! Glad you joined.
You've already gotten lots of good advice on how to deal with your predator problem and integrating your flocks so I'll leave it at just a greeting.
I think you mean a light in the run right?
Wouldn’t work in the coop if it’s solar charged.
I just put up a
Motion activated solar light on my fence right by my gate. I love it.
I have quite a few solar lights my run is always dimly lit.
The motion activated is not only for me but for predators. I have a few mounted on the eves of my house.
So...I think it’s a great idea.