LED based lamp including reflective hood to reduce variation in illuminance
AssigneeIntematix Corporation
InventorHaitao Yang
Life of this patent
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Abstract
A lamp comprises: a thermally conductive body; a plurality of LEDs configured as an array and mounted in thermal communication with the body and a light reflective hood located in front of the plane of light emitting diodes. The hood has at least two frustoconical light reflective surfaces that surround the array of LEDs and are configured such that in operation light emitted by the lamp is within a selected emission angle (beam spread). The hood is configured such that in operation a variation in illuminance (luminous flux per unit area incident on a surface) is 10% or less over approximately a third to one half of the selected emission angle.
Claims25
A lamp comprising:
- a thermally conductive body;
- a plurality of light emitting diodes configured as an array and mounted in thermal communication with the body;
- and
- a light reflective hood located in front of the plane of light emitting diodes, wherein the hood has at least two frustoconical light reflective surfaces that surround the array of light emitting diodes and are configured such that in operation light emitted by the lamp is within a selected emission angle;
- wherein a diameter of a first frustoconical light reflective surface is smaller than a diameter of a second frustoconical light reflective surface more distal to the light emitting diodes than the first frustoconical light reflective surface.
A lamp comprising:
- a thermally conductive body;
- a plurality of light emitting diodes configured as an array and mounted in thermal communication with the body;
- a light diffuser overlying the array of light emitting diodes;
- and
- a light reflective hood overlying the light diffuser,
- wherein the hood is configured to surround the array of light emitting diodes such that in operation light emitted by the lamp is within a selected emission angle, and
- wherein a diameter of the hood is smaller at a first end proximal to the light emitting diodes than at a second end more distal to the light emitting diodes than the first end.
Dependencies are inferred from the claim text.