= Units of photometry
{wiki=Category:Units_of_photometry}
Photometry is the science of measuring visible light in terms of its perception by the human eye. It involves assessing the intensity, quantity, or distribution of light. The key units of photometry include: 1. **Lumen (lm)**: The unit of luminous flux. It measures the total amount of visible light emitted by a source in one second. 2. **Lux (lx)**: The unit of illuminance, which measures how much luminous flux is spread over a given area.
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