So I'm going through my lamp inventory and I came across two lamps that predate my working at this facility. I have 2 HSD 250W/80 lamps, but no fixtures that specify this lamp. We have never owned any fixtures that specify this lamp. Yet I have 2 of them, one of which looks like it has been used before. I do have quite a few fixtures that take the MSD 250 lamp, which has the same base. So...my question is, can this lamp be used interchangably? They are the same base, color temps are different and the voltage is different, but would this be a suitable replacement lamp? I would never want to use two different color temp lamps like that but in a pinch if I was out of lamps and lost one...could this work without damaging the fixture? I've never used a lamp other than what is specifically stated by the manufacturer for an instrument, but they do have the same base, so I know it would at least fit. Just curious. Thougths?