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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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I am a volunteer at a community theater and we are on a pretty tight budget (go figure). Is it safe to use a 750W bulb in a 575W S4 Ellipsoidal fixture. We need more illumination but don't have the money for new fixtures and it would help if we could get more light out of the fixtures we have. At...
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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.
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I read the KnowledgeBase Article: Source Four Beam Spread Quick Sheet. The sheet states tha a 36 degree S4 will throw 50fc at 45'. Is this the same for a 575W and a 750W?. Thanks
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Anyone have a suggestion for what brand of bulb is the best for these lamps. A list of manufacturers would be appreciated. Thanks much