US 8,147,093 B2Granted

Light source having LEDs of selected spectral output, and method for constructing same

AssigneeBridgelux, Inc.

InventorDavid Hum

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Abstract

A compound light source is characterized by an output spectral measure that lies within a spectral measure design range and an average light intensity per component light source that lies within an output intensity design range. The plurality of component light sources includes light sources whose spectral measure value and output intensity lie outside the corresponding design ranges. The component light sources are chosen from a number of predetermined groups obtained by sorting the component light sources with respect to the spectral measure value and output intensity of each source such that the compound light source has a spectral measure value and output intensity that lies within the corresponding design ranges.

Claims14

Dependent claims

A compound light source comprising a plurality of component light sources, said compound light source being characterized by an output spectral measure and an average light intensity per component light source when each component light source is driven with a predetermined design current that is the same for each of said component light sources, said output spectral measure of said compound light source having a value within a spectral measure design range defined by first and second target spectral values, and said average light intensity per component light source being within an output intensity design range defined by first and second intensity values, said compound light source being unsatisfactory for its intended use if said output spectral measure is outside said spectral measure design range or said average light intensity per component light source is outside said output design range, said plurality of component light sources comprising:

first and second component light sources, each component light source being characterized by said spectral measure and by an output light intensity when driven with said predetermined design current, said spectral measure of one of said first and second component light sources having a value outside of said spectral measure design range or said output intensity of one of said first and second component light sources being outside of said output intensity design range when said component light sources are driven with said predetermined current, wherein said first and second component light sources generate a combined light output that is characterized by said spectral measure and an average light intensity per component light source when driven with said predetermined current, said spectral measure of said combined light output having a value within said spectral measure design range and said average light intensity per component light source being within said output intensity design range when said component light sources are driven with said predetermined current.

A method for constructing a compound light source comprising a plurality of component light sources, said compound light source being characterized by an output spectral measure having a value within a spectral measure design range defined by first and second target spectral values and an average light intensity per component light source when each component light source is driven with a predetermined design current that is the same for each of said component light sources, said average light intensity per component light source being within an output intensity design range defined by first and second intensity values, said compound light source being unsatisfactory for its intended use if said output spectral measure is outside said spectral measure design range or said average light intensity per component light source is outside said output design range, said method comprising:

selecting first and second component light sources, each component light source being characterized by a spectral measure and by an output intensity, said spectral measure of one of said first and second component light sources having a value outside of said spectral measure design range or said output intensity of one of said first and second component light sources being outside of said output intensity design range, wherein said first and second component light sources are characterized by a combined spectral measure having a value within said spectral measure design range, and wherein said first and second component light sources are characterized by an average output intensity that lies with said output intensity design range;
mounting said first and second light sources on a substrate;
and
connecting said first and second component light source together to form said compound light source.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 12/815,327Filed 14 Jun 2010
Published: US 2011/0069482 A124 Mar 2011
Granted: 3 Apr 2012
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

F21K 9/00
Light sources using semiconductor devices as light-generating elements
F21Y 2105/10
Planar light sources: comprising a two-dimensional [2D] array of point-like light-generating elements
F21Y 2115/10
Light-generating elements of semiconductor light sources: light-emitting diodes [LED]
Y10T 29/49826
Method of mechanical manufacture: assembling or joining

Family

US 2011/0069482 A1Pre-grant publication · published 24 Mar 2011
US 8,147,093 B2This patent

From the US filing history. Foreign family members aren’t listed.

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