This is a bit off topic since the original question was about bulbs, but make sure that you test the ballasts that you plan on using at all shutter speeds and frame rates. I've been adapting Linear T5HO Grow lights and High-Bay Warehouse lights for film/photo use, and most of the high frequency electronic ballasts, including the Fulhams mentioned here and on DVXuser, have issues at higher frame rates and shutter speeds. Of the ballasts that I have, at 1/250th sec and above, the only ballasts that didn't cause sort of rolling color phase shifts were Advance Powerline Mark 10 dimming ballasts, which actually operate at 42kHz or above according to their literature. Not 25kHz as was mentioned. The fulham workhorse 5, A generic chinese brand, one which is sealed in a small single bulb fixture so I can't see the brand, and a Sunpark SL15 electronic T8 ballast all produced the same results.
On a DVX at 1/250th sec and above, the color shifts slowly from the normal color temp set in camera, to cyan, to very green, then back to normal. The shifts are faster or slower depending on the shutter speed. It can be very slow and subtle and hard to see if you don't watch for it. At 1/250th and above on a Red One, I get the banding or rolling bars caused by ballast flicker combined with the CMOS rolling shutter artifacts. Again it is usually a very slow change in color phase, it just slowly rolls on the Red as opposed to simply slowly changing color on the DVX.
I haven't tested any Kino Flos, or other production motion picture fixtures yet at the same shutter speeds. I did just get some Sylvania Quicktronics and some other Advance ballasts to test and compare. Anyway, I'd just suggest doing your own tests to make sure that things work the way you want them to. Ballasts being electronic and high frequency doesn't necessarily mean that there won't be issues.
