Abstract: A light diffuser for directing light emitted from an elongated lamp toward an area desired to be illuminated, includes a curved member that is positioned between the lamp and the area desired to be illuminated. The curved member is generally parallel to a longitudinal axis of the lamp and is symmetric about a plane that extends through the longitudinal axis. The curved member includes a first curved portion on one side of the plane of symmetry and a second curved portion on the other side of the plane of symmetry. The first curved portion extends from a first end to a second end. The first end is disposed adjacent the plane of symmetry and spaced from the lamp while the second end is disposed adjacent the lamp and spaced from the plane of symmetry. The second curved portion extends from a first end to a second end. The first end of the second curved portion is disposed adjacent the plane of symmetry and adjacent the first end of the first curved portion.

Abstract: A lamp assembly is oriented inside a mounting structure to direct illumination out of an opening in the mounting structure. A coupling is selectively engageable to fix the orientation of the lamp assembly, and selectively disengageable by accessing it through the opening to change the orientation of the lamp assembly. The coupling may comprise a latching assembly that can be selectively engaged to fix the orientation of the lamp assembly at a plurality of predetermined discrete orientations. A stop may be carried by the mounting structure to prevent the lamp assembly from pivoting through the opening.

Abstract: A lamp assembly for supporting at least one elongated lamp is pivotally attached to a mounting structure so that the lamp assembly is rotatable with respect to the mounting structure about an axis generally aligned with a longitudinal axis of the lamp. An otherwise substantially enclosed housing has an opening sized to admit a lamp assembly that pivotally attaches to the housing such that it is rotatable through the opening, and a friction assembly attached to the lamp assembly provides a slidable frictional interface with the housing.