Clay,
I do not know what these costs, but, I know that you can purchase clear plastic tubes to cover fluorescent light bulbs with so that if they "blow" it will contain the glass. You can see these in commercial kitchens, bakeries, etc. No end caps that I know of. You might check at your local hardware or electricial store. Like I stated, I do not know how expensive these tubes are, but, they do exist.
Warren
Fly fishing and fly tying are two things that I do, and when I am doing them, they are the only 2 things I think about. They clear my mind.