12 volt fluorescents
Posted 05 December 2005 - 04:54 PM
Posted 05 December 2005 - 07:45 PM
I have never seen one that isn't, but I'd still check.
Posted 05 December 2005 - 08:20 PM
FYI, i used a lamp that was a plug-in unit, but used a wallwart to convert to 12vdc, and an internal ballast to drive the light. Using a HVR-ZU1 (sony) at 30i cine frame mode I did not detect any flickering or phase shift.
Posted 06 December 2005 - 08:00 AM
Usually, 12V fluorescent tube drivers (which can't really be called ballasts in the same sense as a mains one) are designed around a ringing-choke arrangement, which oscillates at the resonant frequency of the inductor. For any practical inductor in those circumstances, that will be many kilohertz. I'm talking here about the handheld fluorescent flashlights, boat/trailer lighting units, and battery-backed emergency exit signs, that kind of thing. Watch Aliens, where Lance Henriksen's character carries a combination incandescent/fluorescent torch for some of the opening scenes on the planet. That'll be one of those.