Illumination Device for Adjusting Color Temperature Based on Brightness and Time of Day

A light-emitting diode (LED) lighting control method, comprising:

• responsive to receipt of an input signal that includes data representative of a requested change in brightness of one or more operatively couplable LED chains:
• determining, by LED lighting control circuitry, a current time of day;
• determining, by the LED lighting control circuitry, a current color temperature output for the one or more operatively couplable LED chains using a first color temperature curve that includes data representative of a first color temperature as a function of a time of day;
• and
• determining, by the LED lighting control circuitry, a target color temperature output as a function of the current time of day for the one or more operatively couplable LED chains using a second color temperature curve based on the requested change in brightness of the one or more operatively couplable LED chains;
• wherein the second color temperature curve includes at least the target color temperature corresponding to the determined current time of day;
• and
• wherein the target color temperature includes a lesser change in color temperature at solar noon than the change in color temperature at sunrise and sunset.

A non-transitory, machine-readable, storage device that includes instructions that, when executed by LED lighting control circuitry, cause the control circuitry to:

• responsive to receipt of an input signal that includes data representative of a requested change in brightness of one or more operatively couplable LED chains:
• determine a current time of day;
• determine a current color temperature output for the one or more operatively couplable LED chains using a first color temperature curve that includes data representative of a first color temperature as a function of a time of day;
• and
• determine a target color temperature output as a function of the current time of day for the one or more operatively couplable LED chains using a second color temperature curve based on the requested change in brightness of the one or more operatively couplable LED chains;
• wherein the second color temperature curve includes at least the target color temperature corresponding to the determined current time of day;
• and
• wherein the target color temperature includes a lesser change in color temperature at solar noon than the change in color temperature at sunrise and sunset.