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How does tungsten light output drop with voltage?


Toni Vucic

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Hi everyone!

I was reading about line loss in Harry Box's Set Lighting Technician's Handbook when I noticed this:

"a light operates at full efficiency only at its rated voltage. Operating at 108V (90% of its rated power), the 2k in fact produces only about 68% of its normal light output."

But there was no data to back this up, so I was wondering how tungsten output scales with voltage drop. The loss in wattage (see attached picture) only brings us down to 79% power consumed. Couldn't find Harry's email either to ask. Hope you can help me!

Best,
Toni

photo5911432058541027733.jpg

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