Get a plastic Slinky toy from the local dollar store and cut off enough to make a spiral halo that sits on top of your light. Imagine concertina wire without the barbs. It may look a little peculiar but I've had great success with it.
Was doing some searching for garage storage related information recently and came across The Garage Journal. Went to register and to my surprise, discovered that I had actually registered back in 2007! Too long ago to remember exactly why. Lots of great information here!