Luminous flux F
| Luminous intensity is direction-dependent. It is shown in diagrams based on polar or Cartesian coordinates that are known as light distribution curves. The most homogeneous light distribution curve is produced by a flat surface that radiates light in a diffused pattern. Since the luminous intensity is I cos g in directions that are at an angle of g to the normal axis of the surface, the light distribution curve must be a circle. Surfaces that produce this pattern are called Lambert radiators. |
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