No, I never let my guineas out all nite......too many predators lurking around. Guineas have terrible night-sight, and are unable to see dangers when it's dark. I've heard too many stories about owls swooping down and killing them. mkeawsh - I'm glad you haven't had any trouble since you hung those solar blinking red lights, but it didn't work too good with my chickens. When I first started raising birds (at that time, I only had chickens) I also attached them everywhere possible around their coop and surrounding barnyard. We got home maybe a half hour after dusk, only to find a coon had gotten into their coop (we were planning on closing it up when we got home). Out of a flock of 10, it had killed 3..... another one had a slit on her neck and was laying there in shock, and we had no idea what had happened to the rest of them since they were no where to be found. Fortunately, the remaining 6 had escaped out the backdoor and were hiding in the woods, eventually showing up the following morning. Ever since that night, we never relied on the solar blinking red lights to protect the birds. We took every precaution to make sure they were locked up securely anytime we weren't around.
Coons were our problem too. So, I adjusted the blinking lights on all sides of the tractors and coop so that they are eye level to them and the one on the roof is angled so it faces the tree over hanging the structures to deter the coons in the trees and the owls that are always around. Have one on the goat enclosure that is eye level to coyotes and hear them all the time but they never get near.