Method and system for controlling lighting
First Claim
1. A method of controlling lighting in an illuminated common space, comprising the steps of:
- providing plural spaced apart light sources in the space, each of the light sources having plural solid-state lighting devices;
sensing movement of people in the space relative to locations of the light sources; and
in response to the sensing of people moving relative to the lamps, (a) automatically and individually adjusting the solid-state lighting devices in the respective plural light sources to a first lighting condition when people are in a first position relative to the respective light sources, wherein the respective light sources emit light having a first illumination level and a first CRI at a first electrical power level, and (b) automatically and individually adjusting the solid-state lighting devices in the respective plural light sources to a second lighting condition when people are in a second position relative to the respective light sources that is more distant than the first position, wherein the respective light sources emit light having the first illumination level and a second CRI that is less than the first CRI, the respective light sources operating at a second electrical power level when emitting light having the second CRI wherein the second electrical power level is less than the first electrical power level.
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Abstract
A method and system for controlling lighting in a space reduces energy consumption of the light sources by changing at least one of the color rendering index (CRI) and the correlated color temperature (CCT) while maintaining illumination levels. Preferably, the method and system sense movement of people in the space relative to light sources that light the space, and automatically and individually adjust plural solid state lighting devices that form each of the respective light sources to a first lighting condition when people are in a first position, wherein the lamps respectively emit light of a first illumination level and a first CRI at a first electrical power level, and to a second lighting condition when people are in a second position, wherein the light sources respectively emit light of the first illumination level and a smaller CRI than the first CRI and at a lower electrical power level than the first electrical power level.
22 Citations
11 Claims
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1. A method of controlling lighting in an illuminated common space, comprising the steps of:
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providing plural spaced apart light sources in the space, each of the light sources having plural solid-state lighting devices; sensing movement of people in the space relative to locations of the light sources; and in response to the sensing of people moving relative to the lamps, (a) automatically and individually adjusting the solid-state lighting devices in the respective plural light sources to a first lighting condition when people are in a first position relative to the respective light sources, wherein the respective light sources emit light having a first illumination level and a first CRI at a first electrical power level, and (b) automatically and individually adjusting the solid-state lighting devices in the respective plural light sources to a second lighting condition when people are in a second position relative to the respective light sources that is more distant than the first position, wherein the respective light sources emit light having the first illumination level and a second CRI that is less than the first CRI, the respective light sources operating at a second electrical power level when emitting light having the second CRI wherein the second electrical power level is less than the first electrical power level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for controlling lighting in an illuminated space, comprising:
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plural spaced apart light sources in the space, each of the light sources having plural solid-state lighting devices; plural sensors that sense movement of people in the space relative to locations of the light sources; and a controller that, in response to the sensing of people moving relative to the light sources, (a) automatically and individually adjusts the lighting devices in the respective plural light sources to a first lighting condition when people are in a first position relative to the respective light sources, wherein the respective light sources emit light of a first illumination level and a first CRI at a first electrical power level, and (b) automatically and individually adjusts the lighting devices in the respective plural light sources to a second lighting condition when people are in a second position relative to the respective light sources that is more distant than the first position, wherein the respective light sources emit light of the first illumination level and a second CRI that is less than the first CRI, the light sources operating at a second electrical power level when emitting light having the second CRI wherein the second electrical power level is less than the first electrical power level. - View Dependent Claims (10, 11)
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Specification