Patent ID: 8292445

Claim:
A lighting assembly with an omnidirectional light output, comprising: a first light guide frustoconical in shape, the first light guide comprising a base, a light input surface opposite the base, and a first side wall extending between the base and the light input surface; an LED light source adjacent the light input surface; a second light guide conical or frustoconical in shape, the second light guide comprising a base, an apex region opposite the base, and a second side wall extending between the base and the apex region, the second light guide arranged base-to-base with the first light guide; a phosphor layer between the bases of the light guides, the first light guide guiding primary light generated by the light source to the phosphor layer directly and by total internal reflection at the first side wall; and a light transmission medium interposed between the light source and the light input surface, at least some of the light from the light source propagating by total internal reflection in the light transmission medium from the light source to the light input surface; wherein: the phosphor layer converts at least a portion of the primary light to secondary light of longer wavelengths, and outputs the secondary light into the first light guide and the second light guide; and the secondary light and an unconverted portion of the secondary light are output from the lighting assembly omnidirectionally through the first and second side surfaces of the light guides directly and after total internal reflection at the side surfaces.