Knowing illuminance levels is critical for proper lighting design. Distance is measured from the source in meters.This happens because the same total light is spread over a larger area as distance increases. Triple the distance and it reduces to 1/9, and so on. Explanation of the Inverse Square LawĪccording to the inverse square law, illuminance decreases proportional to the inverse of the square of the distance from a point source.ĭouble the distance, and the illuminance decreases to 1/4. This fundamental law describes how illuminance decreases with distance. Laws of Illumination – Explanation And Formulas The Inverse Square Law of Illuminance It also varies by the angle of incidence of light striking a surface. Illumination obeys an inverse square relationship with distance from the source.
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