I wouldn't, but one probably can. However, bulbs with covers are pretty cheap. No cover also means no protection for a very hot bulb from wet conditions that can shatter it. You can find the 20 watt MR-16s at just about any hardware store. I got mine at Home Depot for like $7 each. Even the local mom+pop hardware stores around here have them on their 4 foot display of "specialty lighting".

+1 on the linux thing by the way. Both my work and home pc have run linux 95% exclusively for years now.

Ken