Patent ID: 8905569

Claim:
A lighting fixture, comprising: a directional light source to produce a plurality of light rays; an optical module coupled to the directional light source to receive substantially all of the plurality of light rays produced by the directional light source and focus the substantially all of the plurality of light rays into a beam of light rays to be output by the lighting fixture, wherein an angular distribution of a majority of the beam relative to a vector normal to a ceiling on or near which the fixture is to be installed is in a range of 70 to 95 degrees; a blocking structure to block a direct view of the beam of light when the fixture is installed such that only indirect light is primarily visible from a viewer at least from in or around a working plane substantially parallel to the ceiling, wherein the blocking structure comprises a shelf having a depth sufficient to block the viewer's view of the optical module, the depth depending on a relative orientation of the shelf with respect to a central axis of the optical module; and adjustment means to adjust an orientation of the optical module along its central axis, and an orientation of the shelf along its depth, relative to the vector normal to the ceiling.