Method for controlling the luminous flux spectrum of a lighting fixture
First Claim
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1. A method, comprising acts of:
- A) measuring at least one of a first flux magnitude, a first peak flux wavelength, and a first spectral half-width of first radiation having a first spectrum generated by a first LED-based light source to provide first light source data;
B) measuring at least one of a second flux magnitude, a second peak flux wavelength, and a second spectral half-width of second radiation having a second spectrum, different than the first spectrum, generated by a second LED-based light source to provide second light source data;
C) performing the acts A) and B) initially at a first test temperature;
D) repeating the acts A) and B) at at least a second test temperature and a third test temperature, respectively;
E) storing the first light source data and the second light source data for the first, second and third test temperatures in a memory;
F) determining a first operating temperature for the first LED-based light source and a second operating temperature for the second LED-based light source;
G) determining a first control signal for the first LED-based light source based at least in part on the first light source data at one of the first, second and third test temperatures closest to the first operating temperature;
H) determining a second control signal for the second LED-based light source based at least in part on the second light source data at one of the first, second and third test temperatures closest to the second operating temperature;
I) applying the first control signal determined in the act G) to the first LED-based light source to generate first temperature-calibrated radiation; and
J) applying the second control signal determined in the act H) to the second LED-based light source to generate second temperature-calibrated radiation,such that a combination of the first temperature-calibrated radiation and the second temperature-calibrated radiation provides a composite spectrum.
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Abstract
A method is disclosed for controlling a lighting fixture of a kind having individually colored light sources, e.g., LEDs, that emit light having a distinct luminous flux spectrum that varies in its initial spectral composition, that varies with temperature, and that degrades over time. The method controls such fixture so that it projects light having a predetermined desired flux spectrum despite variations in initial spectral characteristics, despite variations in temperature, and despite flux degradations over time.
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Citations
12 Claims
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1. A method, comprising acts of:
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A) measuring at least one of a first flux magnitude, a first peak flux wavelength, and a first spectral half-width of first radiation having a first spectrum generated by a first LED-based light source to provide first light source data; B) measuring at least one of a second flux magnitude, a second peak flux wavelength, and a second spectral half-width of second radiation having a second spectrum, different than the first spectrum, generated by a second LED-based light source to provide second light source data; C) performing the acts A) and B) initially at a first test temperature; D) repeating the acts A) and B) at at least a second test temperature and a third test temperature, respectively; E) storing the first light source data and the second light source data for the first, second and third test temperatures in a memory; F) determining a first operating temperature for the first LED-based light source and a second operating temperature for the second LED-based light source; G) determining a first control signal for the first LED-based light source based at least in part on the first light source data at one of the first, second and third test temperatures closest to the first operating temperature; H) determining a second control signal for the second LED-based light source based at least in part on the second light source data at one of the first, second and third test temperatures closest to the second operating temperature; I) applying the first control signal determined in the act G) to the first LED-based light source to generate first temperature-calibrated radiation; and J) applying the second control signal determined in the act H) to the second LED-based light source to generate second temperature-calibrated radiation, such that a combination of the first temperature-calibrated radiation and the second temperature-calibrated radiation provides a composite spectrum. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification