Illumination device and method for calibrating an illumination device over changes in temperature, drive current, and time

A method to control luminous output of a fixture that includes a plurality of LED emitters, each of the plurality of LED emitters producing a different output color, the method comprising, for each of the plurality of LED emitters, at each of a plurality of operating temperatures:

• causing, by LED lighting control circuitry, an application of each of a plurality of drive currents to the respective LED emitter while maintaining the remaining plurality of LED emitters in a non-illuminated condition;
• generating, by the LED lighting control circuitry, a plurality of temperature dependent relationships between luminous flux produced by the respective LED emitter and a measured forward voltage across the respective LED emitter at each of the plurality of drive currents, each of the plurality of temperature dependent relationships generated at respective ones of the plurality of operating temperatures;
• and
• causing, by the LED lighting control circuitry, a storage of the first relationship in communicatively coupled memory circuitry.

A non-transitory, machine-readable, storage device that includes instructions that, when executed by LED lighting control circuitry to control luminous output of a fixture that includes a plurality of LED emitters, each of the plurality of LED emitters producing a different output color, causes the LED lighting control circuitry to:

• for each of the plurality of LED emitters, at each of a plurality of operating temperatures:
• cause an application of each of a plurality of drive currents to the respective LED emitter while maintaining the remaining plurality of LED emitters in a non-illuminated condition;
• generate a plurality of temperature dependent relationships between luminous flux produced by the respective LED emitter and a measured forward voltage across the respective LED emitter at each of the plurality of drive currents, each of the plurality of temperature dependent relationships generated at respective ones of the plurality of operating temperatures;
• and
• cause a storage of the first relationship in communicatively coupled memory circuitry.