Calibration procedure for a light-emitting diode light source

A method of calibrating a lighting device, the method comprising:

• emitting light from an emitter of the lighting device;
• measuring luminous flux of at least a portion of the light emitted by the emitter;
• detecting, by a detector disposed in the lighting device, luminous flux of at least a portion of the light emitted by the emitter and internally reflected within the lighting device;
• determining an optical compensation curve characteristic of the detector, the optical compensation curve based on the sum of:
• a first gain factor (A1) characteristic of the detector, the first gain factor determined using the measured luminous flux and a detector current;
• and
• a second gain factor (A2) characteristic of the detector, the second gain factor determined using the measured luminous flux and a detector forward voltage;
• and
• determining an expected luminous flux of at least the portion of the light emitted by the emitter using the detected portion of the light emitted by the emitter by multiplying a value of the detector forward voltage by a value of the optical compensation curve at the detector forward voltage.

A lighting device comprising:

• an emitter configured to emit light, a first portion of the emitted light external to the lighting device and a second portion of the emitted light internally reflected within the lighting device;
• a detector configured to generate a detector signal in response to detecting at least the second portion of the light emitted by the emitter;
• a memory configured to store an optical compensation curve as a function of a measured forward voltage of the detector, the optical compensation curve characteristic of the detector and based on the sum of:
• a first gain factor (A1) characteristic of the detector, the first gain factor determined using a measured luminous flux of the emitter and a detector current;
• and
• a second gain factor (A2) characteristic of the detector, the second gain factor determined using the measured luminous flux of the emitter and the measured forward voltage of the detector;
• and
• a control circuit configured to:
• receive the measured forward voltage of the detector;
• and
• determine an expected luminous flux of the first portion of the light emitted by the emitter by multiplying the measured forward voltage of the detector by a value of the optical compensation curve corresponding to the measured forward voltage of the detector.