Compact light emitting diode retrofit lamp and method for traffic signal lights
AssigneeLeotek Electronics Corporation
InventorsChen H. Wu, Steve Bacilieri, Chao Sung Wang, Shih Chang Wang
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Abstract
A high power LED lamp and method for retrofitting conventional traffic signal lamps. The LED lamp includes a housing, a power supply disposed in the housing, a plurality of LEDs mounted to a substantially planar mounting surface in the housing and electrically connected to the power supply for producing diverging light, and a threaded electrical connector extending from the housing. The method includes replacing a conventional incandescent light bulb with the LED lamp, and installing a Fresnel lens inside the traffic signal lamp that collimates and just fills and illuminates the outer lens of the traffic signal lamp.
Claims20
A traffic signal lamp, comprising:
- a signal housing;
- a front door plate attached to the signal housing;
- an outer lens and an inner lens attached to the front door plate;
- an optical reflector disposed in the signal housing;
- a threaded electrical socket connector disposed in the signal housing;
- and
- an LED lamp that includes:
- a lamp housing,
- a power supply disposed in the lamp housing,
- a plurality of LEDs mounted to a substantially planar mounting surface in the lamp housing and electrically connected to the power supply for producing diverging light, and
- a threaded electrical connector extending from the lamp housing and engaged with the threaded electrical socket connector;
- wherein the inner lens is a Fresnel lens that focuses the diverging light from the LEDs so that the light just fills and illuminates the outer lens without any appreciable amount of the light reflecting off of the optical reflector.
A method of retrofitting a traffic signal lamp having a signal housing, a front door plate attached to the signal housing, an outer lens attached to the front door plate, an optical reflector disposed in the signal housing, a threaded electrical socket connector disposed in the signal housing, and an incandescent light bulb connected to the threaded electrical socket connector for producing light that is reflected off of the reflector and through the outer lens, the method including:
- at least partially detaching the front door plate to expose an inside of the signal housing;
- removing the incandescent light bulb from the threaded electrical socket connector;
- attaching a Fresnel lens to the front door plate;
- connecting an LED lamp to the threaded socket connector, wherein the LED lamp includes:
- a lamp housing,
- a power supply disposed in the lamp housing,
- a plurality of LEDs mounted to a substantially planar mounting surface in the lamp housing and electrically connected to the power supply for producing diverging light, and
- a threaded electrical connector extending from the lamp housing;
- and
- re-attaching the front door plate to the signal housing;
- wherein the Fresnel lens focuses the diverging light from the LEDs so that the light just fills and illuminates the outer lens without any appreciable amount of the light reflecting off of the optical reflector.
Dependencies are inferred from the claim text.