Hey all,
I have an old rail car design that used ballast-free florescent tubes in a
600 VDC circuit; bulbs used in series with power resistors, the circuit basically put 100 VDC or 60 VDC over each bulb. There's no AC source on the car.I can't find these tubes on the market anymore. The last time we purchased them was in 2007 and they had to be manufactured special by Philips. We're thinking of moving to regular T8 tubes with a DC inverter ballast. Anyone here know more about why these are not made anymore or have any ideas where to look?
Thanks, Mike