Patent ID: 7227634

Claim:
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.