I'm in the middle of doing some ballast swapping to free up a 400 watt MV ballast and lamp for my (eventual) next refurb. I took the 150 watt HPS ballast out of my Lumec post top and converted that to Mogul incandsecent with a 500 watt PS-35 lamp in it. The big brother to this (4th generation OV 25) will get the 250 watt HPS ballast I had in this one. One remarkable thing about the ballast I'm using now, the starter components are integrated into the ballast itself so wiring is much easier.