Cool! I got this same bulb from 1000bulbs too for my M-400.

Cool! I have one I got from Lowe's, maybe I'll stick in my B2255 if I ever find a 400w ballast.

Looks like a China Bulb.

yeah that base gives it away , but nice lamp

I think they're still better than what Caster and Philips has though.

These chinese Sylvanias are pretty good! They are made by Sylvania's parent company Osram. Never seen one go dim yet.

I bought one of these earlier this year.

Yeah mine works great. I'm not really fond of the pinkish tone of /DX Sylvania lamps but the quality of the light is the best I've seen from MV so the pros outweigh the cons. I also have an NOS 1990 Sylvania BT37 that I can use in my M-400 too but I'd like the hours on it low, as it's NOS.

I have a few of them too, I use them now instead of my vintage lamps.