Selectable control for high intensity LED illumination system to maintain constant color temperature on a lit surface
First Claim
1. A lighting system, comprising:
- a plurality of light emitting diode (LED) illumination devices, each of which comprises a first group of LEDs of a first color temperature and a second group of LEDs of a second color temperature;
a plurality of illumination device drivers, wherein each illumination device driver is configured to control a corresponding LED illumination device; and
a sensor comprising a Duv sensor that is configured to measure a Duv value of light received from the devices in a location of an environment that is illuminated by the LED illumination devices;
a wireless transmitter that is connected to the sensor and configured to transmit measurements detected by the sensor; and
a hardware device containing programming instructions that are configured to cause a processor to perform a calibration event by;
detecting when the measured Duv value of the light received by the sensor deviates from a desired value corresponding to a desired color temperature,in response to detecting that the value of the measured Duv value deviates from the desired value, generating commands to cause the device drivers for each of the LED illumination devices to control the first group of LEDs and the second group of LEDs in its corresponding illumination device so that the desired color temperature of light will be received at the location while maintaining a substantially constant illuminance level at the location, andwhen the processor receives measurements from the wireless transmitter indicating that the measured Duv value corresponds to the desired value, storing a record of lighting system parameters for a scene to a data set.
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Accused Products
Abstract
A lighting system includes a group of light emitting diode (LED) illumination devices, each of which includes a device driver. One or more sensors are configured to measure a characteristic of light received from the devices in an area of an environment that is illuminated by the devices. A controller detects when a value of the measured light characteristic received by a sensor deviates from a desired value. When this happens, the controller will cause the device drivers for each of the LED illumination devices to control LEDs in each illumination device so that the desired color temperature of light will be received at the location of the sensor while maintaining a substantially constant illuminance level at the location.
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Citations
18 Claims
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1. A lighting system, comprising:
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a plurality of light emitting diode (LED) illumination devices, each of which comprises a first group of LEDs of a first color temperature and a second group of LEDs of a second color temperature; a plurality of illumination device drivers, wherein each illumination device driver is configured to control a corresponding LED illumination device; and a sensor comprising a Duv sensor that is configured to measure a Duv value of light received from the devices in a location of an environment that is illuminated by the LED illumination devices; a wireless transmitter that is connected to the sensor and configured to transmit measurements detected by the sensor; and a hardware device containing programming instructions that are configured to cause a processor to perform a calibration event by; detecting when the measured Duv value of the light received by the sensor deviates from a desired value corresponding to a desired color temperature, in response to detecting that the value of the measured Duv value deviates from the desired value, generating commands to cause the device drivers for each of the LED illumination devices to control the first group of LEDs and the second group of LEDs in its corresponding illumination device so that the desired color temperature of light will be received at the location while maintaining a substantially constant illuminance level at the location, and when the processor receives measurements from the wireless transmitter indicating that the measured Duv value corresponds to the desired value, storing a record of lighting system parameters for a scene to a data set. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of controlling light directed to a surface, comprising:
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operating a plurality of light emitting diode (LED) illumination devices to direct light to a surface of a facility, wherein each illumination device comprises; a first group of LEDs of a first color temperature and a second group of LEDs of a second color temperature, and a device driver configured to control the LED illumination device; and by a controller, performing a calibration event by; receiving a Duv value of light detected by a Duv sensor that is proximate to the surface; detecting when the received Duv value deviates from a desired value corresponding to a desired color temperature, in response to detecting that the received Duv value deviates from the desired value, causing the device driver for each of the LED illumination devices to control drive currents delivered to the first group of LEDs and the second group of LEDs of its corresponding illumination device so that the desired color temperature of light will be directed to a location of the sensor while maintaining a substantially constant illuminance level at the location, and when the controller receives measurements from a wireless transmitter indicating that the measured Duv value corresponds to the desired value, store a record of lighting system parameters for a scene to a data set. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification