I'm looking for a 100 watt 120v Mercury Postline ballast to go with my Holophane post top fixture.

I think I've tracked one down.  I'll know in a couple weeks.

Icefoglights

 i have a NOS 100w  postline laying around one is 120 volts and the other is 277 volts.
 I can live with the 277 volt one becase i have a step up transfomer. but the only different
 is make it have more ballast lost in wattage. but it wont be in use all the time.
 it for a future project that dont know when i will get started. The only real reason i got the 120 volt one is to drop the step up transformer. what are you willing to offer for one or in trade. I dont mind helping other lighting nuts that are in need.

I'm not sure.  Is there anything your looking for?

I have one on the way.  I would like to get a second one, just in case I can find a second matching Holophane.  I want to put them on either side of the driveway as a matching set.

well the only thing in need of is a 100w  C&C ballast for my explosion proof fixture. since it blowing
MV lamps. making the arc tube black with in min of runing. or if you have any ballast that will run a F20
tubes nicely at full power on preheat tulamp if possable. i will be glad to help you out on a second ballast.
give me some time though to look for that ballast since my tinker shop is a mess.

I do have a spare 120v 100w H38 CWA Advance ballast and cap.  High power 20 watt ballasts are hard to come by though, and even my tulamps are a little on the weak side.