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Note: the inverse square law can only be used in cases where the light source approximates a point source. For lambertian light sources (see Section 4.3, “ (ii) Inverse Square Law. The illumination of a surface is inversely proportional to the square of the distance of the surface from the source. In other words, E Inverse square law:- Page 2. The illumination of surface is inversely proportional to the square of distance between source and light surface provided that the Figure 4.2 — Lambert's cosine law. Light Measurement Handbook. Adapted from the IESNA Lighting Handbook - 9th Edition. Page 24Inverse Square Law. • Established by J. H. Lambert as one of the earliest lighting laws to enable the calculation of illuminance. • The illumination of a The inverse-square law for light intensity states: The intensity of illumination is proportional to the inverse square of the distance from the light source. State Inverse Square law of Illumination. Laws of Illumination. The original standard of light was Wax Candle, which is highly unreliable. It was replaced by a. According to this law the illumination at any point on a surface is proportional to the cosine of the angle between the normal at that point and the direction