|Publication number||USRE40619 E1|
|Application number||US 11/225,841|
|Publication date||Jan 6, 2009|
|Filing date||Sep 13, 2005|
|Priority date||Dec 5, 2002|
|Also published as||CA2447995A1, CA2447995C, US6817732|
|Publication number||11225841, 225841, US RE40619 E1, US RE40619E1, US-E1-RE40619, USRE40619 E1, USRE40619E1|
|Inventors||David W. Knoble, Eugene Graff|
|Original Assignee||Genlyte Thomas Group Llc|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (33), Referenced by (1), Classifications (11), Legal Events (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention relates to an improved efficiency fluorescent lighting system. More specifically the present invention is directed towards a fluorescent light fixture and system wherein the light fixture may be utilized within a fluorescent lighting system, the system requiring fewer lamps due to the higher efficacy of the lamps and ballast. The system utilizes a high efficiency lamp in combination with a dimming ballast having a high ballast factor in combination with a relatively high spacing to mounting height ratio.
Fluorescent lighting systems within retail environments typically require fairly narrow spacing of the light fixture in order to assure proper illumination on the floor midway between overhead luminaires. By increasing the number of fixtures within the area to be illuminated, energy usage obviously increases dramatically. It is therefore desirable to widely space the luminaires within the fluorescent lighting system while also assuring proper illumination within the illuminated area. Most fluorescent lighting systems in retail sales produce approximately 1,000 to 1,200 lumens per foot based on an industry standard of a 0.88 ballast factor for an electronic ballast exhibiting typically 2,750 initial lumens for a T8 four foot lamp. For reasonable illumination, it is usual to place the luminaires approximately 12 to 15 feet above the floor space in continuous rows which are spaced 12 feet apart. Such placement of luminaires yields uniform illumination at appropriate levels. Separation of the luminaires to predefined distances larger than 12 feet causes noticeably reduced illumination on the floor space.
Improved efficiency lighting systems such as disclosed herein allow reduction in the total number of luminaires placed within the lighting system while also maintaining adequate illumination. Such increase in efficiency of the lighting system may allow for increasing the spacing of the individual luminaires within the fluorescent lighting system with corresponding reduction in power usage over the entire system since fewer luminaires are required. Each individual fixture may use more power to produce a higher lumen output, but the overall lighting requirements may be met by fewer fixtures. This may also be coupled with in store placement of a fluorescent lighting system which is designed to be utilized in combination with day lighting within the store structure and dimming ballast to reduce power usage. Thus, energy usage during the day light hours may be significantly reduced when used in combination with a high efficiency fluorescent lighting system as described herein.
The improved efficiency fluorescent lighting system of the present invention combines a high efficiency fluorescent lamp, a dimming ballast having a high ballast factor of approximately 1.2 and a luminaire which allows a relatively high spacing to mounting height ratio of about 1.5. Such an improved efficiency fluorescent lighting system may result in a power reduction of about 18% or more due to the high lumen output of the individual luminaires in combination with the reduced number of fixtures required within the system.
The improved efficiency fluorescent lighting system of the present invention utilizes a luminaire which has a spacing to mounting height capability of at least 1.5. Such luminaires exhibit a good photometric distribution for vertical foot candles such as a retail store rack or when other vertical space areas need to be illuminated. Thus, the luminaire utilized in the improved efficiency fluorescent lighting system of the present invention may be, for example, a Day-Brite TWRM fluorescent lighting product which has a spacing to mounting height ratio of 1.6.
The spacing to mounting height ratio (S/MH) is defined as the spacing between two luminaires such that the illumination on the floor midway between the two luminaires is equal to the illumination from one luminaire at nadir. This value is the ratio of the spacing to the mounting height of the luminaires. In the improved efficiency fluorescent lighting system of the present invention, as depicted in
Obviously, with increased spacing to mounting height ratio, a more efficient optical package and increased illumination from each individual luminaire is required. The system of the present invention utilizes a dimming ballast which may be used to dim the fluorescent lights in order to save energy when full lighting is not needed. These types of dimming ballasts may be used when skylights are implemented within the building structure to supplement electrical lighting. Dimming ballasts achieve a reduction in lumen output of the fixture by reducing the effective lamp current. Such dimming ballasts may necessarily require use of a rapid or programmed start ballast having a ballast factor of approximately 1.2. The ballast may use high frequency power as it is more efficacious in fluorescent lighting than 60 Hz power, thereby making it possible to run the lamps at a full rate of 32 watts and therefore obtain a ballast factor of approximately 1.2.
Ballast factor, as used herein, is defined by ANSI C82.2 1984, and is the relative light output of a lamp operated on the ballast with respect to the same lamp on a reference ballast. Typical electronic fluorescent ballasts exhibit a ballast factor of approximately 0.88. Utilizing a ballast having a higher ballast factor may at times cause damage to either the ballast or to the lamp by overdriving the lamp current thereby damaging the lamp and electrodes. However, with the system of the present invention and in particular the high efficiency lamps utilized, each lamp may be run at full 32 watts of power to produce the required lumen output.
The improved efficiency fluorescent lighting system of the present invention utilizes an electronic dimming ballast having a high ballast factor of 1.15 to 1.2 thereby producing a higher lumen output for the lamps. The lamps utilized in the system of the present invention are high efficiency lamps such as the Phillips Advantage lamp or the Osram Sylvania XPS lamp, both of which are four foot T8 lamps producing approximately 3,250 lumens. These lamps generally produce 3,040 lumens maintained and thus are a higher efficacy lamp as opposed to standard T8 fluorescent lamps. Utilization of the high efficiency lamps, dimming ballast and luminaire having a high spacing to mounting height ratio permits the system of the present invention to produce the same light as a standard fluorescent light system with only ⅔ of the fixtures required and 80% of the power usage.
As an example, in a typical retail lighting installation utilizing 6,000 lamps, the improved efficiency fluorescent lighting system of the present invention would only use 4,000 lamps and, due to the higher efficacy of the lamps and dimming ballast described herein, only about 82% of the electrical energy would be consumed. A standard known system having 6,000 lamps each utilizing 31 watts of power exhibits a total load of 186 kilowatts thereby producing 14 Mlumens. The improved efficiency fluorescent lighting system of the present invention would use 38 watts per lamp having a total load of 152 kilowatts producing 16 Mlumens. The system of the present invention thereby exhibits a savings of power usage of approximately 33 KW or 18%. The system of the present invention would exhibit a savings while the luminaires are fully powered and also while they are fully dimmed during daylight hours. Thus, in an exemplary store having 125 kilowatts of lighting, approximately 200,000 kilowatt hours per year may be saved. Such savings are exhibited by a 25 kilowatt reduction in load when the lights are fully powered and a 20 kilowatt reduction when the lights are fully dimmed assuming 10 hours of day of dimmed operation and 14 hours of day of full power operation.
Various additional modifications may be made to the illustrated implementations without departing from the spirit and scope of the invention. Therefore, the invention lies in the claims hereinafter appended.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US1902026||Oct 7, 1930||Mar 21, 1933||Pass & Seymour Inc||Reflector socket|
|US2434781||Mar 15, 1946||Jan 20, 1948||Garden City Plating & Mfg Co I||Lamp fixture|
|US2455333||Sep 22, 1943||Nov 30, 1948||Sylvania Electric Prod||Fluorescent lamp locking device|
|US2539974||Mar 3, 1947||Jan 30, 1951||Gordon J Turner||Flashlight with adjustable head|
|US2687516||May 31, 1950||Aug 24, 1954||Schneiderman Eli||Guards for fluorescent light tubes|
|US2958763||Dec 23, 1957||Nov 1, 1960||Sunbeam Lighting Company||Fluorescent light fixture assembly|
|US3049579||Mar 8, 1960||Aug 14, 1962||Advance Transformer Co||Ballast canister construction|
|US3155324||Aug 23, 1961||Nov 3, 1964||Westinghouse Electric Corp||Ceiling lighting fixtures|
|US3349237||Dec 29, 1964||Oct 24, 1967||Sylvania Electric Prod||Strip lighting fixture and connector therefor|
|US3555267||Sep 13, 1967||Jan 12, 1971||Lok Products Co||Ventilated lighting fixture|
|US3816880||Dec 4, 1972||Jun 18, 1974||Prudential Lighting Corp||Multiple detent retaining clip|
|US3909100||May 14, 1974||Sep 30, 1975||Hodge Jr Thomas||Mounting arrangement for a lamp|
|US4000406||Nov 29, 1974||Dec 28, 1976||Esquire, Inc.||Light fixture|
|US4054790||May 17, 1976||Oct 18, 1977||Esquire, Inc.||Light fixture|
|US4298918||Jun 13, 1980||Nov 3, 1981||Keene Corporation||Fluorescent fixture socket|
|US4323953||May 19, 1980||Apr 6, 1982||National Service Industries, Inc.||Floodlight|
|US4407011||Dec 8, 1980||Sep 27, 1983||Donn Incorporated||Integrated lighting systems for suspended ceilings or the like|
|US4422132||Dec 14, 1981||Dec 20, 1983||Sim Kar Lighting Fixture Co., Inc.||Fluorescent-type fixture having improved fold-out lamp socket assemblies|
|US4494175||Jan 9, 1984||Jan 15, 1985||Gte Products Corporation||Recessed lighting fixture with improved louver mounting|
|US4498126||Oct 7, 1983||Feb 5, 1985||Wide-Lite International Corporation||Lighting fixture with relamping socket apparatus|
|US4646212||Nov 15, 1985||Feb 24, 1987||Lightolier Incorporated||Recessed lighting fixture|
|US5008790||Mar 14, 1989||Apr 16, 1991||Genlyte, Inc.||Fluorescent-type fixture having removable fold-out lamp sockets|
|US5183327||Sep 10, 1991||Feb 2, 1993||Keene Corporation||Fluorescent light fixture with open ballast housing|
|US5371444||Apr 20, 1993||Dec 6, 1994||The Genlyte Group Incorporated||Electronic ballast power supply for gas discharge lamp including booster start circuit responsive to power up condition|
|US5658067||Aug 17, 1995||Aug 19, 1997||Munters Corporation||Modular light unit|
|US5800050||Mar 4, 1996||Sep 1, 1998||Nsi Enterprises, Inc.||Downlight and downlight wall wash reflectors|
|US6164797||Aug 17, 1998||Dec 26, 2000||Genlyte Thomas Group Llc||End mount ballast- socket bridge|
|US6346782||Jan 2, 2001||Feb 12, 2002||Genlyte Thomas Group Llc||Multiple lamp ballast system|
|US6422721||May 22, 2000||Jul 23, 2002||Genlyte Thomas Group Llc||Tube guard system|
|US6805470||May 15, 2003||Oct 19, 2004||Ardee Lighting/Usa, Inc.||Light fixture including an improved latch mechanism|
|US6817732||Dec 5, 2002||Nov 16, 2004||Genlyte Thomas Group Llc||Efficiency fluorescent lighting system|
|US6854860||Feb 21, 2003||Feb 15, 2005||Genlyte Thomas Group Llc||Master-satellite retrofit assembly and method of retrofitting recessed strip lighting fixtures|
|US20050201094||Feb 14, 2005||Sep 15, 2005||Genlyte Thomas Group Llc||Master-satellite retrofit assembly and method of retrofitting recessed strip lighting fixtures|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|USD787112 *||Jul 30, 2015||May 16, 2017||Moda LLC||Cove lighting fixture|
|U.S. Classification||362/225, 362/411, 362/221, 362/260, 362/227, 362/147|
|International Classification||F21S4/00, F21S2/00|
|Cooperative Classification||F21Y2103/00, F21S2/00|
|May 9, 2012||FPAY||Fee payment|
Year of fee payment: 8
|Jun 24, 2016||REMI||Maintenance fee reminder mailed|
|Nov 16, 2016||LAPS||Lapse for failure to pay maintenance fees|