Joe's right, though i don't use it. I tested these lamps on my OV-10, which has a true 175W MV ballast. I need to get the reflector back from my grandpa though. He was supposed to buff it out to make it shiney but he's been too busy. Plue we've been talking about upgrading his shop lighting. I'll go into detail about that in thr forum though since this would be a very long comment otherwise lol.
ahh. I remember you had a sleeve like this so i thought it was canadian. Makes sense though since NH was on the sleeve.