Giesemann Fixture - Tridonic Ballasts

[Binare]

Ill admit those guys over there at commercial lighting aren't the sharpest tools in the shed, my account manager is getting me a price on ordering them in for ya. Don't bother with the reactor type (cap and core) style, I checked for electronics. Only way I'd consider going reactor is if running a digital timer or a controller and longevity and cost is a major issue. Digital timers and controllers can depending on the manufacturer leak current through the id, this will reduce the ballast and bulb life. An electronic ballast will increase life over the bulb by balancing strike and maintain voltages with less differential then reactors. In your case bulbs will cost you more then these (hopefully!) Ballasts... So makes more sense to have longer bulb life then ballast life.
Ill let you know how much and how long when she calls me back.