Patent ID: 6945671

Claim:
A lighting unit that provides adjustable beam spread, including at least one lighting cell comprising: an elongated electric U-shaped tubular fluorescent lamp, known as biax, having a curved end and a double contact end; an elongated reflector having a generally parabolic cross-sectional shape, symmetrically disposed about a central plane of symmetry that extends from a closed rear region of the reflector to a generally rectangular frontal light-exit aperture; a first mounting assembly, made and arranged to support the double contact end of the lamp relative to the reflector, having a first base bracket mounted fixedly relative to the reflector near a first end thereof and extending within the reflector, a socket-mount bracket adjustably attached to the first base bracket, and socket means for electrically connecting to the double contact end; a second mounting assembly, made and arranged to support the curved end of the lamp relative to the reflector, having a second base bracket mounted fixedly relative to the reflector near a second end thereof and extending within the reflector, a lamp-holder bracket, adjustably attached to the second base bracket, made and arranged to support the curved end of the lamp; the first and second mounting assemblies each being provided with a user handle made and arranged to enable a user to conveniently deploy any one of the three preset light source positions and thus cause the lighting unit to produce a corresponding one of the three predetermined angles of beam spread; said first and second mounting assemblies being made and arranged to support the lamp located in the central plane, substantially parallel to the rear of the reflector and in a manner to enable a user, with requiring tools, to move the light source to a selected one of three preset light source locations with different separation from the rear region of the reflector corresponding to three designated angles of beam spread.