Ok so I have this fixture that has a ballast for a 50w PSMH lamp but for some reason it does not like ignitors so I want to instead run a mercury lamp off of it. First I would like to know which mercury lamp will work and second, I know I have to remove the ignitor but I have a wiring question. The ballast has a red and blue that go to the ignitor. The red also ties into the socket. When I remove the ignitor do I connect the red to the socket and cap off the blue wire?

I'm not entirely sure on that one. Maybe someone on here who has done more experimenting like Don would know a little more about this than I would but if I were to take a guess, I'd say, try a 75 watt mercury vapor lamp and see how that works.

Ok thanks.

Ok so I have this fixture that has a ballast for a 50w PSMH lamp but for some reason it does not like ignitors so I want to instead run a mercury lamp off of it. First I would like to know which mercury lamp will work and second, I know I have to remove the ignitor but I have a wiring question. The ballast has a red and blue that go to the ignitor. The red also ties into the socket. When I remove the ignitor do I connect the red to the socket and cap off the blue wire?

50W MH is 0.75A/70V lamp, need OCV >200V (beside the ignition pulses). That mean the output current into ~110V load (usual lower wattage burner MV) it would feed about 0.65..0.7A, so about 60..65W
So 75W MV would be OK (it would run slightly underdriven, but not as much, it should tolerate it well)

50W MV would work too, but that would be overdriven, so may suffer shorter life.

Where did you get the 50 Watt fixture from. I would like to get one as well.

It was on ebay.