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US 9,179,512 B2Granted
Multi-segment LED lighting apparatus configurations
AssigneeCree, Inc.
InventorLiqin Ni
Life of this patent
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Abstract
A solid state lighting apparatus can include a Light Emitting Diode (LED) string that includes a plurality of light emitting diode (LED) segments that are coupled in series with one another wherein a ratio of respective numbers of LEDs in each of the segments is about equal to a ratio of respective average powers for each of the respective segments. Other configurations are also disclosed.
Claims22
A solid state lighting apparatus comprising:
- a Light Emitting Diode (LED) string including a plurality of light emitting diode (LED) segments coupled in series with one another wherein a ratio of respective lumen output from each of the segments, being provided by a respective total epi-area for each of the segments, is about equal to a ratio of respective average powers for each of the respective segments;
- wherein a ratio of respective numbers of LEDs in each of the segments is about equal to the ratio of the respective average powers for each of the respective segments;
- and
- wherein a first-on/last-off segment included in the plurality of segments includes LEDs having highest efficacy of all LEDs in the string and a last-on/first-off segment included in the plurality of segments includes LEDs having lowest efficacy of all LEDs in the string.
1 more element
A solid state lighting apparatus comprising:
- a Light Emitting Diode (LED) string including a plurality of light emitting diode (LED) segments coupled in series with one another, wherein a first-on/last-off segment included in the plurality of segments includes LEDs having highest efficacy of all LEDs in the string and a last-on/first-off segment included in the plurality of segments includes LEDs having lowest efficacy of all LEDs in the string.
A solid state lighting apparatus comprising:
- a Light Emitting Diode (LED) string including a plurality of light emitting diode (LED) segments coupled in series with one another, wherein a ratio of respective numbers of LEDs in each of the segments is about equal to a ratio of respective average powers for each of the respective segments and a first-on/last-off segment included in the plurality of segments includes highest efficacy LEDs in the string and a last-on/first-off segment included in the plurality of segments includes lowest efficacy LEDs in the string.
Dependencies are inferred from the claim text.