Abstract: A lighting unit comprising a lamp and a reflector provides high intensity, high efficiency, even illumination over an area of particular shape and size and has a cut-off angle which enables a person to approach close to the lighting unit without seeing the lamp or its reflection. The reflector comprises at least two spaced apart curved reflector surfaces which join each other along an edge line in a plane behind and spaced from the lamp. Points on the curve line of each reflector surface are spaced progressively further away from the lamp than the edge line. Some points on the curve are located on the side of the plane remote from the lamp. The lighting unit, which may employ reflector surfaces in addition to those above mentioned, may be employed in systems wherein it projects light upwardly for downward reflection from a ceiling or projects light downwardly directly onto a work surface.

Abstract: Lighting fixture having a housing with an open side. A lamp is mounted in the housing that is capable of producing light rays which pass through the open side of the housing. A protective covering of glass is carried by the housing and encloses the open side. The protective covering of glass is provided with a surface which has a high angle anti-reflection coating disposed on the surface.

Abstract: A lighting fixture and method using multiple reflections having a housing with an open side. A lamp is mounted in the housing and produces rays of light which pass through the open side. First and second reflecting surfaces are carried by the housing for reflecting light. The first and second reflecting surfaces are positioned on opposite sides of the lamp so that direct rays from the lamp will strike the first reflecting surface and be reflected onto the second reflecting surface and then will be reflected through the open side of the housing at a high angle with respect to the angle of the original direct rays from the lamp.

Abstract: Lighting fixture having housing with an open side. A lamp is mounted in the housing and produces rays which pass through the open side. The housing carries an internal reflecting surface for reflecting light rays from the lamp through the open side. The internal reflecting surface includes Fresnel type portions for reflecting light rays from the lamp at high angles through the open side. In certain applications, the open side would be enclosed by a glass enclosure. In order to increase the efficiency of the lighting fixture, an anti-reflection coating can be provided on both sides of the glass enclosure. BACKGROUND OF THE INVENTIONMany different types of lighting fixtures hereto fore have been provided. However in connection with such lighting fixtures there always is a need for increased reflectivity from the reflective portions of the lighting fixture. In addition, there is a further requirement to obtain better control over the direction of the light emitted from the lighting fixture.

Abstract: A light fixture for use in indirect lighting including a fixture assembly for supporting an elongated high intensity lamp in generally horizontally disposed relationship and including a reflector assembly for directing light from the lamp against an opposing surface in an evenly distributed pattern. The reflector assembly includes a pair of opposed side reflectors, opposed end reflectors adjacent the ends of the side reflectors, and diagonally disposed reflector panels which join the end reflectors to the side reflectors.

Abstract: A louver unit for a lighting fixture assembly wherein blades extending longitudinally of the axis of an elongated lamp have reflective side surfaces curved on a relatively smaller radius and blades extending perpendicular to said elongated lamp have corresponding surfaces curved on a relatively greater radius. This produces an output of light in the longitudinal plane more nearly equal to that in the transverse plane.

Abstract: Luminaires equipped with an improved high efficiency, wide light distribution lighting panel provide more favorable ESI values and may be spaced farther apart than conventional ones. The lighting panel includes three bands of conical prismatic elements; these bands are spaced on 5-inch centers from each other and are separated by substantially transparent bands having shallow 15.degree. flutes to soften the lamp images. Outside the bands of conical prisms are bands of lengthwise elevating prisms for increasing the spread of light to the sides of the fixture. Outside the elevating bands are bands of lengthwise depressing prisms. A single panel design provides similar excellent optical characteristics for either a two-lamp or three-lamp troffer.