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  1. Units of luminous flux
  2. Units of measurement
  3. Quantity
  4. Mathematical concepts
  5. Mathematics
  6. Index

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Lumen (unit) by Ciro Santilli 37 Updated 2025-05-26 +Created 2024-07-29
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1 Watt equals 683 Lumens of light power at wavelength 555 nm. At other wavelengths 1 Watt is less Lumens as it takes into account the sensitivity of the average human eye.
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