Abstract: A multi-lamp fluorescent light fixture which includes provision for mounting a linear fluorescent lamp on each of its for sides. A single ballast, contained inside the fixture reflector housing, is rated to start and supply four lamps and is wired for connection to up to four sets of bracket-mounted lamp sockets. The light fixture may be mounted in any of three orthogonal illumination directions using one to four installed lamps. A single invention light fixture can replace at least five presently available individual light fixtures, and provides new field installation options for contractors and customers.

Abstract: Two or more single linear fluorescent lamp reflector housings are pivotably joined together so that at least one end of each single reflector housing overlaps an adjacent reflector housing. Provision is made for each reflector housing to be folded around or slid rectilinearly along the side of its adjacent reflector housing, thus adjusting the overall length of the fixture for installation. Shadowing effects caused by spaces between the ends of individual lamps are eliminated by the overlaps, and the fixtures may be folded for shipping or storage, requiring only a short packing length.

Abstract: A lamp power electronic ballast circuit, which can be packaged in a small, compact module and is designed for starting and energizing a high intensity discharge lamp with high frequency power. The ballast circuit contains provision for correction of the source input power factor to near unity, greatly reducing ballast losses associated with input power factor, and includes a unique starter circuit using a transformer small in size and low in losses, and producing a pulse of at least 6000 volts with current sufficient to start a metal-halide high intensity discharge lamp.