Illumination – Elongated source light unit or support – Plural sources or supports therefor
Patent
1987-02-06
1988-05-31
Husar, Stephen F.
Illumination
Elongated source light unit or support
Plural sources or supports therefor
362217, F21S 300
Patent
active
047485477
ABSTRACT:
In order to eliminate glare from a space illuminated by an uplight luminaire, an elongated reflector is employed in conjunction with a pair of mutually vertically oriented fluorescent lamps to obtain uniform light intensity on the space ceiling. The reflector, in cross section, includes a central point from which first and second line segments extend symmetrically in opposite directions and at slight respective downward angles. At the end of each of the first and second line segments, one or more additional line segments extend upwardly and at such angles as to simulate corresponding sections of a parabolic curve. The pair of fluorescent lamps are situated in over and under mutual orientation and are disposed with their axes positioned vertically immediately above and parallel with the longitudinal extension of the central point. As a result of this reflector/lamp-pair combination, a "bat wing" light intensity distribution pattern is achieved in which the least illumination of the ceiling area within the field of illumination is directed straight up and systematically more intense illumination is directed outwardly and angularly to thereby obtain uniform illumination intensity across the ceiling surface. The uniformity of distribution is independent of the spacing of the luminaire from the space ceiling.
REFERENCES:
patent: 2240179 (1941-04-01), Doane
patent: 3591798 (1971-07-01), Florence
patent: 3647148 (1972-03-01), Wince
patent: 4242725 (1980-12-01), Dorima et al.
patent: 4344111 (1982-08-01), Ruud et al.
patent: 4573111 (1986-02-01), Herst et al.
Lightolier Catalog, "Fluorescent Incandescent Architectural Lighting by Lightolier", (no date given), pp. 8 and 9.
Cates Charles E.
Husar Stephen F.
Phillips James H.
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