Dark

The nights are drawing in now.

I have a security light outside my garage which is a very welcome sight when |I get home in the dark. My house is down a longish driveway and I don't get any light from streetlamps. Unfortunately, the light has stopped working - a blown bulb I suspect, but unfortunately, I can't undo the screw to get the casing off to take the bulb out. I've tried WD40, and an impact screwdriver, but to no avail. I don't want to ruin the screwhead by trying too hard to undo it, but I hate it when my strength, or lack of, gets the better of me. Not sure what to do now...