Selective output wave-guide

A lighting assembly comprising:

• a. a wedge shaped wave-guide with a light emitting portion, a back side, and a light admitting end;
• b. a prism with a smooth side and a grated side adjacent to the wedge shaped wave-guide;
• and
• c. at least one light source positioned to emit light into the light admitting end of the wedge shaped wave-guide.

An optical device for directing light from a light source consisting of:

• a. a wedge shaped wave-guide with a light emitting portion, a back side and a light admitting end, such wedge shaped wave-guide having a first index of refraction;
• b. a prism placed adjacent to the wedge shaped wave-guide with a smooth side and a grated side, wherein the prism has a second index of refraction that is less than the first index of refraction;
• and
• c. a third medium adjacent to the wedge shaped wave-guide opposite the prism, wherein the third medium has a third index of refraction that is less than the second index of refraction.

A method of automotive lighting comprising the steps of:

• a. providing at least one light source;
• b. providing a wave-guide with a light emitting portion and a light admitting end;
• c. selecting an approximately equal exiting angle for each light ray emitted by the wave-guide by having each light ray emitted by the at least one light source pass through the wave-guide;
• and
• d. causing each light ray to be emitted through the light emitting portion of the wave-guide.

A lighting assembly comprising:

• a. a wave-guide, with a light admitting end and a light emitting portion made up of a plurality of angular facets, selecting an approximately equal exiting angle for each light ray emitted by the wave-guide through its light emitting portion;
• b. at least one light source providing light arranged and disposed to direct light into the light admitting end of the wave-guide;
• and
• c. a means for causing each light ray traveling through the wave-guide to be emitted from the face of the wave-guide.