LED-based lighting system for retrofitting fluorescent lighting fixtures in a transit vehicle
First Claim
1. An LED-based lighting unit for retrofitting a fluorescent light fixture in a transit vehicle, the LED-based lighting unit comprising:
- an elongate fixture frame securably attachable within a fluorescent lighting fixture cavity of the transit vehicle, said cavity having outwardly angled opposing elongate walls, said cavity having left and right electrical sockets for supporting and providing power to a fluorescent tube light, wherein the elongate fixture frame substantially conforms to the shape of the cavity so that the elongate fixture frame fits snugly therein, the elongate fixture frame having a transverse member with outwardly angled opposing sidewalls extending from the transverse member and each forming an obtuse internal angle therewith so that the angle of each sidewall generally matches the pitch of the fluorescent lighting fixture cavity'"'"'s outwardly angled opposing elongate walls;
left and right non-conductive pins extending from the elongate fixture frame, said left and right non-conductive pins securably attaching the elongate fixture frame to the left and right sockets within the fluorescent lighting fixture cavity without making electrical connection with the electrical sockets;
a heat conductive mounting surface on the elongate fixture frame;
a plurality of light-emitting diodes (LEDs) disposed along a length of said heat conductive mounting surface, for illuminating an interior area of the transit vehicle; and
a diffusive lens cover removably attachable to an output opening of the fluorescent lighting fixture cavity.
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Accused Products
Abstract
An LED-based lighting unit for retrofitting a fluorescent light fixture in a transit vehicle has a concave frame or structure conforming to the shape of the fluorescent lighting fixture cavity, connector pins on either end of the frame for secure attachment to sockets of the fluorescent fixture, a plurality of LED modules for illuminating an area of a transit vehicle, a power adapter for receiving and converting an input power supply signal, and a diffusive lens cover. The frame may have rear fins or other features for facilitating dissipation of heat generated by the LEDs. A controller adjusts the intensity of the LEDs based on a reading from a temperature sensor and on a manual brightness setting. The change in light output may be accomplished by reducing a duty cycle of a pulse width modulated (PWM) waveform supplying the LEDs.
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Citations
36 Claims
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1. An LED-based lighting unit for retrofitting a fluorescent light fixture in a transit vehicle, the LED-based lighting unit comprising:
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an elongate fixture frame securably attachable within a fluorescent lighting fixture cavity of the transit vehicle, said cavity having outwardly angled opposing elongate walls, said cavity having left and right electrical sockets for supporting and providing power to a fluorescent tube light, wherein the elongate fixture frame substantially conforms to the shape of the cavity so that the elongate fixture frame fits snugly therein, the elongate fixture frame having a transverse member with outwardly angled opposing sidewalls extending from the transverse member and each forming an obtuse internal angle therewith so that the angle of each sidewall generally matches the pitch of the fluorescent lighting fixture cavity'"'"'s outwardly angled opposing elongate walls; left and right non-conductive pins extending from the elongate fixture frame, said left and right non-conductive pins securably attaching the elongate fixture frame to the left and right sockets within the fluorescent lighting fixture cavity without making electrical connection with the electrical sockets; a heat conductive mounting surface on the elongate fixture frame; a plurality of light-emitting diodes (LEDs) disposed along a length of said heat conductive mounting surface, for illuminating an interior area of the transit vehicle; and a diffusive lens cover removably attachable to an output opening of the fluorescent lighting fixture cavity.
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2. An LED-based lighting unit for retrofitting a fluorescent light fixture in a transit vehicle having a fluorescent light compartment with left and right walls, said left and right walls having left and right electrical sockets capable of supporting and providing power to a fluorescent tube light, the LED-based lighting unit comprising:
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a transverse frame member securably attachable within the fluorescent light compartment, wherein said transverse frame member substantially conforms to the shape of the fluorescent light compartment so that the transverse frame member fits snugly therein; wherein said transverse frame member has a backwall portion with a top edge and a bottom edge, the transverse frame member further comprising opposing metallic sidewalls extending and outwardly angled from the top and bottom edges respectively of the backwall, each of the opposing metallic sidewalls forming an obtuse internal angle with the backwall so as to conform to the angle of the fluorescent lighting fixture cavity'"'"'s outwardly angled opposing elongate walls; left and right endpieces disposed at either end of the transverse frame member and adapted to be placed in the left and right electrical sockets of the fluorescent light compartment without making electrical connection therewith; and a plurality of light-emitting diodes (LEDs) mounted to the backwall portion of the transverse frame member and disposed between the outwardly angled sidewalls of the transverse frame member. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. An LED-based lighting unit for retrofitting a fluorescent light fixture in a transit vehicle having a concave fluorescent light compartment with a generally parabolic cross section, the concave fluorescent light compartment having left and right walls with respective left and right electrical sockets capable of supporting and providing power to a fluorescent tube light, the LED-based lighting unit comprising:
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a transverse frame member securably attachable within the concave fluorescent light compartment, wherein said transverse frame member substantially conforms to the cross-sectional shape of the fluorescent light compartment to fit snugly therein, said transverse frame member having a backwall portion with a top edge and a bottom edge running along a lengthwise axis thereof, the transverse frame member further comprising opposing metallic sidewalls extending and outwardly angled from the top and bottom edges respectively of the backwall to lie substantially flush within the concave fluorescent light compartment to form a seal therewith; a plurality of light-emitting diodes (LEDs) disposed along the backwall portion of the transverse frame member and between the outwardly angled sidewalls of the transverse frame member; and a diffusive lens cover removably attachable to an opening of the fluorescent light compartment, wherein the diffusive lens cover is positioned such that light from the LEDs passes through the diffusive lens cover. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification