You got me on the question. I don't know the difference between a short-arc and long-arc bulb. I can tell you all about the SPD charts of the various bulbs (mercury doped, iron doped, etc.) available for the ULF-28 but don't know anything about the arc issue. But I will find out if you give me more information?


Quote Originally Posted by avandesande
Is this a short-arc bulb?