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Point Light Source

A point light source radiates its energy uniformly so that light rays spread out from it in all directions. Illumination at a point on a surface varies with the intensity and shape of the light source and the distance of the surface from it. The amount of light falling on a unit area (the illuminance) decreases with the square of the distance (the inverse square law).

[Light and Color, by Clarence Rainwater, Prof. of Physics, San Francisco State College, Original Project Editor Herbert S. Zim, Golden Press, NY, Western Publishing Company, Inc., 1971]

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