Philips HPR 125w mercury lamp (hard glass version)

One of my luckiest lamp bin finds to date (like the time I found that 600w Reflux HPS...) I couldn't believe seeing this just lying there, screwed into a rather nice porcelain lampholder which I also kept. I'm even more pleased this is the hard glass version of the HPR, as the only other one I have in my collection is a soft glass one. This lamp looks healthy enough, although sadly it has some scratches in the black acid-etched coating on the reflector neck, one such scratch has also obscured the date code.