Illumination – Light source and modifier – Including reflector
Patent
1997-08-29
2000-05-30
Husar, Stephen
Illumination
Light source and modifier
Including reflector
362263, 362346, 362443, F21V 700
Patent
active
060683880
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an dual reflector lighting system or luminaire having an outer reflector and an auxiliary or inner reflector which distributes the light in a certain way to direct a first predetermined amount of light onto the floor or work area and a second predetermined amount of light above the work area. The subject invention increases the efficiency of the lighting system so that a fixture with a high intensity discharge (HID) lamp of lower wattage can be used to get substantially equal or greater lighting on the work area. Alternatively, a fixture in accordance with this invention which uses the same wattage lamp as a conventional fixture will provide a substantially greater amount of light on the work area. The invention includes a luminaire having a high intensity discharge lamp, an outer reflector, and an auxiliary reflector mounted within the outer reflector and movable relative to the lamp for concentrating light in a first work area beneath the luminaire and providing a certain amount of light outside or above the first area. The invention also covers a dual reflector assembly, including an inner and an outer reflector adjustable relative to each other, the assembly adapted to be mounted to an HID fixture. The invention also relates to an auxiliary reflector and bracket assembly for retrofitting conventional fixtures, and a retrofit kit for retrofitting conventional fixtures of a specific wattage, to dual reflector systems of lesser wattage.
High bay lighting fixtures are typically used in warehouses and manufacturing plants. Such lights are generally referred to as high intensity discharge (HID) lights or gaseous discharge lights. Conventional high bay lighting fixtures direct all of the light equally leaving the areas closest to the fixture too bright and the working areas furthest from the fixture too dim. In a typical warehouse, light fixtures will be between 15 to 65 feet above the floor. Most light is usually required at the working surface or floor level, not at the top of the storage racks or near the ceiling. However, the storage racks require sufficient lighting to enable workers operating fork lifts to have sufficient visibility to remove products from the racks and to store products in the racks. In order to obtain a desired level of light at the working area with such conventional fixtures, a fixture of higher wattage must be used. This creates overly bright conditions closer to the ceiling where it is not needed. In installations in warehouses where there are rows of racks of merchandise, with aisles therebetween, conventional HID lighting systems typically use 400 watt and 1,000 watt luminaires for such installations. The subject invention permits the 400 watt luminaires to be replaced with 250 watt luminaires, and in some instances, 150 watt luminaires, and the 1,000 watt luminaires to be replaced by 400 watt luminaires. When such a replacement is made using the subject invention, the amount of foot candles measured at the floor level is substantially the same, or greater, while the lighting at the top of the racks may be reduced, but is still more than sufficient for workers to be able to function. The energy savings resulting from use of the lower wattage lamps is typically between 40-65%. This results in substantial reduction of energy costs. Not only do customers benefit by a reduction in energy costs by replacing 400 watt fixtures with 250 watt fixtures, or even 150 watt fixtures, but, in installations using air conditioning or refrigeration, they also reduce the amount of air conditioning or refrigeration costs incurred by reducing the heat or kilowatt loading of the work space. Furthermore, they obtain an increase in efficiency from personnel working in a building by having an improved lighting level at the working surface.
BACKGROUND ART
Henderson Jr., et al U.S. Pat. No. 4,173,037 discloses a luminaire lamp support device in which the lamp socket is adjustably mounted on a bracket for adjustment of the socket along a substantially vertical
REFERENCES:
patent: 5582479 (1996-12-01), Thomas et al.
Thomas James E.
Walker William H.
EPPI Lighting, Inc.
Husar Stephen
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