Illumination – Light source and modifier – Louvered or grid type modifier
Patent
1990-07-19
1991-04-16
Lazarus, Ira S.
Illumination
Light source and modifier
Louvered or grid type modifier
362342, 362354, F21V 1106
Patent
active
050087916
ABSTRACT:
A lighting system for room lighting includes a light grid comprised of intersecting first and second sets of parallel elongated parabolic louvers. The louvers of at least one of the first or second sets are angularly oriented to nadir and spaced apart to confine light passing downwardly therethrough to an asymmetrical candlepower distribution curve. One quadrant of the curve, termed a "wall washing quadrant" is on one side of the curve and a "low direct glare quadrant" is oriented to an opposite side of the curve. The light and light grid are placed adjacent the wall such that the wall washing quadrant is oriented toward the wall to illuminate the wall and the low direct glare distribution quadrant is oriented toward the interior of the room. The wall washing quadrant eliminates the "cave effect" at the juncture of the adjacent wall and the ceiling while the low direct glare quadrant provides desired illumination directed into the adjacent room. Variations of the grid arrangement allows for uniform lighting of corners as well as end and side walls within a room.
REFERENCES:
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patent: 3582642 (1971-06-01), Johansson
patent: 4042817 (1977-08-01), McNamara, Jr.
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patent: 4368504 (1983-01-01), Sato et al.
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patent: 4621309 (1986-11-01), Grawe et al.
patent: 4780800 (1988-10-01), Mullins
patent: 4896656 (1990-01-01), Johnson
Kingston Industries Corporation Advertisement.
Cole Richard R.
Lazarus Ira S.
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