Nonimaging light source.

摘要

The principles of non-imaging optics, rather than imaging optics, are used to provide a high power LED (3) illumination lamp (1) that has a specified limited viewing angle ( theta r). A compound parabolic flux extractor (5) extracts and concentrates light emitted by an LED chip (3) and a light pipe (21) continues the concentration into the specified viewing angle ( theta r). A lens (41,91,101) or a diffusant (113,115) may be used to modify the light output of the lamp (1). A light constructed as an array of the lamps (1) is suitable for use an an automobile external light such as a center high mounted stop light.