Question for lighting experts

[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

[mike31154]

Next logical step would be to try the suspect bulb in a different socket/reflector. Could still be a bad bulb too though, they're pretty complex inside compared to a standard filament bulb.

[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?

[marie]

I have 3 new 10k SE XM bulbs and for ballasts I have an old hamilton hqi ballast, a bluewave 3 hqi ballast and this new dial a watt ballast. Both hqi ballasts will light any of the 3 new bulbs, the dial a watt won't start any of them (most of the time)

I have changed the settings on the dial from normal 250w to the hqi but neither setting will work consistently

[Cal_stir]

if you are swithing the harness and pendant together, I would have to say that you have a bad ballast.
The last thing I would try is a different power source if you haven't tried that.