Do you know the differential between pressure of a HPS bulb and a pyrex RBF? Sounds like a cool idea.
The drinking glass idea isn't a good one though, to seperate the bulb from the stem, you can't cut it securely without high-price burglary equipment, that would bring more unwanted attention, although the alternative is to use a torch, of course you would need a very good torch for that, if it is a good quality glass, it will be harder, if it isn't, it won't be worth the cutting, the obvious solution, just buy some cheap glassware, I have known tweakers who can get 500ml and 1000ml FBF, it suprised me, they were close to the local cooks though and planned on trading them, that was in my dreams though. Point is, find out how much pressure those light bulbs can withstand or just get glassware, if any tweeker can get em, you can too.
Doesn't this go in Chemicals & Equipment?