High efficiency lighting units with beam cut-off angle

Details High efficiency lighting units with beam cut-off angle High efficiency lighting units with beam cut-off angle

1977-12-20

1980-10-21

Nelson, Peter A.

Illumination

Light source and modifier

Including reflector

362 97, 362367, 362348, F21V 700

Patent

active

042297826

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. The lighting units located in some systems are so that the reflector opening is near eye level of a standing or sitting person.

REFERENCES:
patent: 2145732 (1939-01-01), Nickel
patent: 2258875 (1941-10-01), Arras
patent: 2297781 (1942-10-01), Korengold
patent: 3132812 (1964-05-01), Strobel
patent: 3169709 (1965-02-01), Goodbar
patent: 3944810 (1976-03-01), Grindle
patent: 3950638 (1976-04-01), Kent et al.
patent: 4071883 (1978-01-01), Dennis

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