GE 150 watt Arcstream

For Mark, so I dug out the lamp and did some calculations from my service log’s, it wasn’t 2 years, but 4,719 hours run time, (just over a year), and although the tube is still clean, you can see the operating effects on the balls of the electrodes (or lack of them)!, this dramatically raised the arc voltage from it’s specified 94, to 138 volts measured the night before I removed the lamp from service!, the lamp was running at about 45 degrees horizontal, with the electrodes in a parallel position, and had become flickery and unstable!