What about the UHP bulbs, the glass seems thick enough to withstand a mini-explosion? They are much thicker than the everyday bulbs we use. The bulb of Sanyo XP21 looks more like a spotlight garden bulb, one would think it costs $20-$30 instead of $400+.
Is it possible to just change the bulb without the casing? Most of the high cost is probably due to the bulb casing. Come to think of it, the casing does not look like it costs that much...