Abstract: A high efficiency illumination system having lighting fixtures in spaced apart relation, light reflector panels in the lighting fixtures having two side by side central curved portions and two curved side portions on respective sides of the central portions, and the central and side curved portions being angled to one another, lighting tube receptacles in the lighting fixtures to support at least one lighting tube, ballasts for supplying power at the appropriate voltage to the lighting tubes, ballast boxes for containing ballasts separate from the lighting fixtures, heavy duty wiring for supplying power at a first line voltage to the ballast box from a power supply, and, light duty power supply for transmitting power from the ballast box to the lighting fixtures at a second voltage lower than the line voltage, there being a plurality of lighting fixtures connected by respective light duty wiring to a single common ballast box.

Abstract: A troffer extension attachable to the walls of a lighting troffer, and with portions of a ceiling to raise the troffer relative to the ceiling, and having extension members, upper devices on one end of the members for engaging the troffer, and, lower devices on the other ends of the members for engaging the ceiling.

Abstract: A two part lighting fixture having side walls, and end walls, forming a reflector, supports around the lower edge of such side and end walls, by which the fixture is supported in a ceiling, upper edges of the side and end walls defining an opening, a movable electrical container movably received in the opening, the container being formed of sheet metal of predetermined thickness, for enclosing electrical fittings, and having lighting receptacles and, releaseable supports for the container.