See local light source.

(n) A light source located at a specified point in space. In rendering, the point light source is usually close to the model. Because the light radiates omnidirectionally from the point source, no two rays hit a planar surface at the same angle. An uncovered incandescent light bulb is analogous to a point light source.

1. With respect to angular subtense, a source of light, such as a star, that is very small. In a lab, a point source may be simulated by imaging a large source onto and through a pinhole, or by focusing a parallel bundle of light, such as that from a laser, with a precise lens to a point image. 2. in lens design, a fictitious infinitely small source of radiation.