Hmm I'm personally a coated MV fan (be it /DX, /C, or whatever). I'd have to say either 175W /DX MV or 175W MH. The 150W HPS retrofit lamp sounds cool, but I thought they couldn't be used on CWAs, only reactors and HX? If you go with HPS, check out a plastic lens on it, since I think you have one that you used on your M-400A2 before. These M-400 split doors (250W HPS) at my school have plastic lenses. They're cool since they're deeper than the glass lenses. The ones at my school don't work. They must not be powered up anymore, but they must have been at some point, seeing how browned the lenses are. This one looks like it's been shot at, but they missed the lamp, unless they relamped it after it was shot out. This might be hard to see, but here's the base of a fourth one that must've been hit down at some point. I had always wondered why there was three lights and nothing there, so I looked around along the curb and what do you know! A hidden pole base, half-buried in the sidewalk! I moved some of the grass out of the way and there are still wires in the base too, a white and a black, so they're 120V too. I wonder if that's why they're not powered up anymore. Maybe the base shorted out or something... It's under 2ft of snow now from when they plowed... I wonder what the original light are, since the school is from the 50s. I assume these aren't the original lights to the poles. The anchor bolt covers are decorative, so the poles are probably from the 50s. They're very rusty and weak looking but they've held up well through the past decade's storms. If I see one fall, I'm taking it though (what's left of it anyway...) And here's a bullhorn bracket pole that looks old enough to have held incandescent floods on it! It's been headless for as long as I've known it. I wonder if the pole has power still or if it's on the same circuit as the M-400 split doors. There's no other poles near it, so I wonder if there used to be other poles and they just fell over the years.