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Bookmark or Share- Illuminance: Definition, Formula, Units, and Applications - Science FactsFormula. Mathematically, illuminance (E) is expressed as the ratio of luminous flux (Φ) incident onto a surface to the surface area (A) receiving that flux. This core formula can be articulated as follows: E = Φ A E = Φ A. Where: – ∅ is luminous flux (in lumens or lm) – A is the surface area (in square meters or m²).
- Luminance vs. Illuminance: What’s the Difference? - HunterLabIlluminance is a concept of photometry, represented by the amount of light received on a surface. Illuminance also relates to how humans perceive an illuminated area's brightness. Illuminance measurements are usually used in fields such as photography, cinematography, architecture, and interior design. Occupational health and safety also use ...
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