Question for lighting experts

[Cal_stir]

Originally Posted by marie

When I change the bulbs around on the ballasts I'm actually changing the ballasts around on the bulbs.
ie: I don't move the bulbs I just plug the ballast into a different reflector so I don't think the bulb is at fault

ok, so it is the same ballast that won't fire the new bulb but it fires all the old bulbs, and the other ballasts fire the new bulb, is that correct?

if so, have you tried the new bulb in a different pendant?