Light sensing apparatus and method for luminaire calibration

A light sensing method for luminaire calibration, wherein a single light sensing unit is used to sense light intensities of a plurality of LED modules including a first LED module, a second LED module, and a third LED module, the method comprising:

• storing an ideal intensity value of each channel of the LED modules;
• synchronizing initial base frequencies of channels of the LED modules for ensuring an synchronization of light signals of the channels of the LED modules by aligning rising edges of the light signals according to a base clock;
• modulating an illuminating frequency of the first LED module by a driving controller;
• activating the light sensing unit;
• sensing the light signal from the channel of the first LED module;
• de-activating the light sensing unit;
• modulating the modulated illuminating frequency of the first LED module to its initial base frequency;
• modulating an illuminating frequency of the second LED module by the driving controller;
• activating the light sensing unit;
• sensing the light signal of the channel of the second LED module;
• de-activating the light sensing unit;
• modulating the modulated illuminating frequency of the second LED module to its initial base frequency;
• modulating an illuminating frequency of the third LED module by the driving controller;
• activating the light sensing unit;
• sensing the light signal of the channel of the third LED module;
• de-activating the light sensing unit;
• modulating the modulated illuminating frequency of the third LED module to its initial base frequency;
• configuring a switching cycle of the light sensing unit to ensure the light sensing unit is activated and de-activated periodically with the light signal from only one channel is sensed at one time;
• and
• executing a calibration according to a comparison between the sensed light signal of each channel and the ideal intensity value.

A light sensing apparatus for luminaire calibration, comprising:

• a plurality of LEDs;
• a plurality of regulating units electrically connected with the LEDs for regulating currents inputted to the LEDs;
• a light sensing unit for retrieving light signals from the LEDs;
• a driving controller electrically connected with the regulating units for storing an ideal intensity value of each LED and controlling an outputted power and a driving frequency, and electrically connected with the light sensing unit for retrieving sensing signals from the light sensing unit;
• and
• a switching unit disposed between the light sensing unit and the driving controller for switching the light sensing unit;
• wherein, the light sensing unit is periodically activated and de-activated by the switching unit;
• wherein the driving controller synchronizes initial base frequencies of the LEDs according to a base clock by aligning rising edges of the light signals, and incorporates a frequency-modulation means to modulate the initial base frequencies of the light signals of the LEDs in a predetermined sequence, so that the light sensing unit senses light intensities of the light signals of the LEDs in a switching cycle of the light sensing unit and the driving controller executes a calibration according to a comparison between the sensed light signal of each LED and the ideal intensity value.