Patent ID: 8807816

Claim:
A luminaire comprising a light guide having a first refractive index (n 1 ), the light guide comprising a light-entry surface, a light-reflecting surface for reflecting light entering at the light-entry surface, and a light-exit surface opposite said light-reflecting surface, for allowing light to exit from the light guide, the light guide being tapered toward the opposite end relative the light-entry surface, said luminaire further comprising a light source, arranged to emit light toward said light-entry surface; a first optical member, having a second refractive index, in optical contact with the light-exit surface of the light guide; a second optical member, having a third refractive index in optical contact with the light-reflecting surface of the light guide; and a functionality-enhancing optical structure arranged on the opposite side of said second optical member in relation to the light guide, for affecting an optical property of said luminaire when the light source is in an off-state, wherein the first refractive index is greater than each of the second, and third refractive indices, and the second refractive index is greater than the third refractive index, wherein said second optical member is air.