Patent ID: 7207699

Claim:
A system of light units each having one of a plurality of predetermined light emission properties for illuminating a space, each light unit comprising: a support structure comprising a smooth and uninterrupted light permeable plate; at least one hollow light guide with a cavity; at least one lamp for directing light into the cavity; optical components carried by said support structure, said components having light directing properties for influencing the beam path of the light output from the lamp; at least one of said optical components being a light permeable component having a medium with a first index of refraction and having a boundary surface with a medium of a second index of refraction different from the first, said light permeable component being part of a light output device and said boundary surface being provided with a non-planar light-refractive structure for deflecting light in at least one plane directed perpendicular to a light exit face, so that the light intensity distribution curve of the light emerging at the light exit face is influenced in this plane; at least one of said optical components of each light unit being an element selected from the group consisting of a plurality of cap reflectors having optical properties differing from the others, a plurality of non-planar light-refractive structures having optical properties differing from the others and a plurality of input reflectors having optical properties differing from the others, said element being carried by said support whereby the one or more optical components carried by said support structure determine said one of a plurality of predetermined light emission properties of said light units.