Giesemann Fixture - Tridonic Ballasts

[es355lucille]

I own a Giesemann (Original 230 series, I believe) fixture c/w 2 x 150 MH lights. I would like to modify this fixture to accomodate 2 x 250 MH.

I am totally assuming that these two ballasts will only run 150w MH bulbs.

Does anyone know where I can get Tridonic Ballasts from?

Or if there is one that would work in its place?

Thanks
Brad