LED device for wide beam generation
First Claim
1. A luminaire comprising:
- a plurality of light modules; and
a fixture operable to position the plurality of light modules above an area to be illuminated,wherein each light module comprises;
a substrate; and
a quantity of light sources mounted to the substrate, each light source comprising;
at least one light emitting diode; and
a lens positioned to accept light from the at least one light emitting diode,wherein the lens exhibits symmetry with respect to a first reference plane that extends through the lens and the substrate,wherein a second reference plane extends through the substrate and the lens and is substantially perpendicular to the first reference plane,wherein the lens comprises a feature that is disposed on a first side of the second reference plane, andwherein the feature is operative to receive light propagating on the first side of the second reference plane and to redirect said received light through the second reference plane for propagation on a second side of the second reference plane so that the each light source in the quantity outputs a respective pattern of light that is biased to the second side of the second reference plane relative to the first side of the second reference plane and that has a respective intensity,wherein each light module is operative to produce a pattern of light substantially matching said respective pattern of light with an intensity that is substantially equal to said respective intensity multiplied by the quantity.
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Accused Products
Abstract
An apparatus and method is characterized by providing an optical transfer function between a predetermined illuminated surface pattern, such as a street light pattern, and a predetermined energy distribution pattern of a light source, such as that from an LED. A lens is formed having a shape defined by the optical transfer function. The optical transfer function is derived by generating an energy distribution pattern using the predetermined energy distribution pattern of the light source. Then the projection of the energy distribution pattern onto the illuminated surface is generated. The projection is then compared to the predetermined illuminated surface pattern to determine if it acceptably matches. The process continues reiteratively until an acceptable match is achieved. Alternatively, the lens shape is numerically or analytically determined by a functional relationship between the shape and the predetermined illuminated surface pattern and predetermined energy distribution pattern of a light source as inputs.
161 Citations
20 Claims
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1. A luminaire comprising:
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a plurality of light modules; and a fixture operable to position the plurality of light modules above an area to be illuminated, wherein each light module comprises; a substrate; and a quantity of light sources mounted to the substrate, each light source comprising; at least one light emitting diode; and a lens positioned to accept light from the at least one light emitting diode, wherein the lens exhibits symmetry with respect to a first reference plane that extends through the lens and the substrate, wherein a second reference plane extends through the substrate and the lens and is substantially perpendicular to the first reference plane, wherein the lens comprises a feature that is disposed on a first side of the second reference plane, and wherein the feature is operative to receive light propagating on the first side of the second reference plane and to redirect said received light through the second reference plane for propagation on a second side of the second reference plane so that the each light source in the quantity outputs a respective pattern of light that is biased to the second side of the second reference plane relative to the first side of the second reference plane and that has a respective intensity, wherein each light module is operative to produce a pattern of light substantially matching said respective pattern of light with an intensity that is substantially equal to said respective intensity multiplied by the quantity. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A street luminaire comprising:
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a plurality of light modules; and a fixture that is configured to position the plurality of light modules for illuminating a street that extends in a direction, wherein each light module comprises; a substrate; and a number of light sources disposed adjacent the substrate, each light source comprising; a respective lens; and at least one respective light emitting diode coupled to the respective lens, wherein the respective lens is intersected by a plane that extends in the direction, the plane having a street side and a curbside, and wherein a portion of the respective lens is disposed on a curbside of the plane and is operative to receive light from the at least one respective light emitting diode that is headed curbside and to reflect said received light to pass through the plane, so that the respective lens produces an illumination pattern of an intensity, the illumination pattern biased street side relative to curbside, and wherein each light module produces a scaled version of the illumination pattern, the scaled version having a second intensity that is approximately equal to the intensity multiplied by the number. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A street luminaire comprising:
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a first number of light modules, each operable to produce an illumination pattern with a first intensity; and a fixture that is operable to mount and power the first number of light modules to produce the illumination pattern with a second intensity for illuminating a street, the second intensity substantially equaling the first intensity multiplied by the first number, wherein each light module comprises a second number of light sources, each light source comprising; at least one respective LED; and a respective optic comprising a first side that the fixture orients curbside and a second side that the fixture orients street side, wherein the first side of the respective optic and the second side of the respective optic are optically different from one another, wherein the respective optic is mounted with the at least one respective LED such that the first side of the respective optic receives light from the at least one respective LED and the second side of the respective optic receives light from the at least one respective LED, wherein the first side of the respective optic is operable to send street side a substantial amount of the light that the first side of the respective optic receives, resulting in biasing the illumination pattern street side relative to curbside, and wherein the respective optic is operable to produce the illumination pattern of a third intensity, and the first intensity substantially equals the third intensity multiplied by the second number. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification