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Foot-lambert (abbreviated as ft-L) is a unit of measurement used to quantify luminance, which is the amount of light that is emitted, transmitted, or reflected from a surface in a specific direction. Specifically, it is defined as the luminance of a surface that emits or reflects one lumen per square foot. In different contexts, luminance is an important measure for assessing how bright a surface will appear to the human eye under various lighting conditions.

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  1. Units of luminance
  2. Units of measurement
  3. Quantity
  4. Mathematical concepts
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