Incandescent Lumens at Different Voltages « on: October 16, 2025, 07:48:03 AM » Author: NeXe Lights
How do I calculate how many lumens an incandescent bulb would output at different voltages other than its rated voltage? For example, if a 150W 130V incandescent bulb outputs 2200 lumens at 130V, how many lumens would it output at 120V?
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	Re: Incandescent Lumens at Different Voltages « Reply #1 on: October 16, 2025, 08:42:29 AM » Author: dor123
You need a device called integrating sphere to measure lumens, which is very expensive and large.
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Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

I only working with the international date format (dd.mm.yyyy).

I lives in Israel, which is a 220-240V, 50hz country.

	Re: Incandescent Lumens at Different Voltages « Reply #2 on: October 16, 2025, 10:17:51 AM » Author: Medved
Here is quite useful graph.
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