Importance

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Abstract

A light bulb includes a base, a light source and a light guide having opposed major surfaces and a light input edge that receives light from the light source, the light propagating along the light guide by total internal reflection and the light guide including a light output region on one of the major surfaces. An optical adjuster has a first region having a light modifying characteristic and a second region. The optical adjuster and light output region are variably positionable relative to one another to selectively apportion light emitted from the light output region between the first region and the second region, the light apportioned to the first region being modified by the light modifying characteristic thereof so that light output from the light bulb is modified based on relative positioning of the optical adjuster and the light guide.

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First Claim