I tried this with a flashlight at the end of the living room, but it was too close. I think you probably could if you were about 30-40 yards away, but not 30-40 feet away. I think street lights would work too, but I haven't tried with them before.
I usually set my SCT out an hour before darkness falls to try and get it thermally acclimated. I also set a fan on my back porch and have it oscillating, but that's more just to cool off the area where I'll be sitting than trying to cool the scope.
There are bright lights at the apartment complex across the way... I’m going to point there since the clouds are still out (I set it up outside to cool, and hope that by 10PM the clouds are gone, as forecast).