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Hi Derek - the difference is - the filaments are sized slightly differently so that one achieves rated performance at 115V, the other at 120V. Historically, the 115V version came first - designed specifically for theater applications where most lamps are at the end of multiple feet of cable with multiple...
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I would add that some sites that use ETC Sensor Dimming will set the output regulation to 115V or so and then use 120V lamps. (A little less bright but longer lamp life) To answer your question directly: In a perfect world, 2 lamps with only a difference in voltage rating will give the same performance...
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Hi - This might be as much socket related as lamp base related. The old TP22 - the Source Four socket for the last 200 years - will wear out eventually and not do a great job holding the lamp in the PAR socket. In the last 2-3 years, we have gone to using either a Bender & Worth socket or a new Sylvania...
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Is anyone else out there having difficulty with the new HPL lamps that have a ceramic heat sink? I can't seem to keep them seated in the Source 4 par lamp socket. The metal heat sink lamps work geat but are oddly a bit harder to come by.