Lux To Watts Calculator
Estimate power (watts) from illuminance (lux) and area for a specified light source type using luminous efficacy. Use it to test different inputs quickly, compare outcomes, and understand the main factors behind the result before moving on to related tools or deeper guidance.
Last updated
Formula
Power (W) = (Illuminance × Area) / Efficacy
Result
5 W
50 lux over 10 m² at 100 lm/W requires 5 watts.
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