An ambient light detector, a detector array and a method are disclosed. An ambient light sensor includes a first plurality of sensor elements, where each sensor element is configured to provide a signal in response to a level of illumination and a second plurality of reference elements, each reference element configured to provide a reference signal and each including a blocking element configured to shield the respective reference element from being illuminated, where the first plurality is larger than the second plurality and the first plurality of sensor elements and the second plurality of reference elements are arranged in an array, and where a sensor element and a reference element are laterally arranged on or in a common layer substrate sharing at least one common first contact.

An ambient light detector, a detector array and a method are disclosed. An ambient light sensor includes a first plurality of sensor elements, where each sensor element is configured to provide a signal in response to a level of illumination and a second plurality of reference elements, each reference element configured to provide a reference signal and each including a blocking element configured to shield the respective reference element from being illuminated, where the first plurality is larger than the second plurality and the first plurality of sensor elements and the second plurality of reference elements are arranged in an array, and where a sensor element and a reference element are laterally arranged on or in a common layer substrate sharing at least one common first contact.

A method and apparatus for a light fixture that uses current sharing across any one or more parallel LED strings within the light fixture. A processor determines the current requirements of the one or more LED strings that are needed to produce a given intensity level. The processor then apportions the current generation capability of a power supply across all active LED strings using time division multiple access (TDMA) whereby each LED string conducts its apportioned current within its allocated time slot to the mutual exclusion of the remaining active LED strings in any given time period. The light fixture utilizes LEDs with increased forward voltage interspersed with LEDs having reduced forward voltage in the same LED string. A processor utilizes shunt devices across the one or more LEDs with increased forward voltage to substantially match the cumulative forward voltage of each LED string.

A method and apparatus for a light fixture that uses current sharing across any one or more parallel LED strings within the light fixture. A processor determines the current requirements of the one or more LED strings that are needed to produce a given intensity level. The processor then apportions the current generation capability of a power supply across all active LED strings using time division multiple access (TDMA) whereby each LED string conducts its apportioned current within its allocated time slot to the mutual exclusion of the remaining active LED strings in any given time period. The light fixture utilizes LEDs with increased forward voltage interspersed with LEDs having reduced forward voltage in the same LED string. A processor utilizes shunt devices across the one or more LEDs with increased forward voltage to substantially match the cumulative forward voltage of each LED string.

Aspects of the present invention relate to methods and systems for measuring and managing the brightness of digital content in a field of view of a head-worn computer.

Aspects of the present invention relate to methods and systems for measuring and managing the brightness of digital content in a field of view of a head-worn computer.

A method and apparatus for an indoor horticultural system that utilizes a wired network to control lighting. The wired interface is used to relay both analog and digital intensity control information, whereby an analog signal is used to control the intensity of all LED arrays in each lighting fixture during a first mode of operation and a digital signal is used to control the intensity of each individual LED array in each lighting fixture in a second mode of operation. Both the analog and digital signals utilize the same physical interface.

A method and apparatus for an indoor horticultural system that utilizes a wired network to control lighting. The wired interface is used to relay both analog and digital intensity control information, whereby an analog signal is used to control the intensity of all LED arrays in each lighting fixture during a first mode of operation and a digital signal is used to control the intensity of each individual LED array in each lighting fixture in a second mode of operation. Both the analog and digital signals utilize the same physical interface.

An illumination device and method are provided herein for calibrating individual LEDs in the illumination device to obtain a desired luminous flux and a desired chromaticity of the device over changes in drive current, temperature, and over time as the LEDs age. The calibration method may include subjecting the illumination device to a first ambient temperature, successively applying at least three different drive currents to a first LED to produce illumination at three or more different levels of brightness, obtaining a plurality of optical measurements from the illumination produced by the first LED at each of the at least three different drive currents, obtaining a plurality of electrical measurements from the photodetector and storing results of the obtaining steps within the illumination device to calibrate the first LED at the first ambient temperature. The plurality of optical measurements may generally include luminous flux and chromaticity, the plurality of electrical measurements may generally include induced photocurrents and forward voltages, and the calibration method steps may be repeated for each LED included within the illumination device and upon subjecting the illumination device to a second ambient temperature.

An illumination device and method are provided herein for calibrating individual LEDs in the illumination device to obtain a desired luminous flux and a desired chromaticity of the device over changes in drive current, temperature, and over time as the LEDs age. The calibration method may include subjecting the illumination device to a first ambient temperature, successively applying at least three different drive currents to a first LED to produce illumination at three or more different levels of brightness, obtaining a plurality of optical measurements from the illumination produced by the first LED at each of the at least three different drive currents, obtaining a plurality of electrical measurements from the photodetector and storing results of the obtaining steps within the illumination device to calibrate the first LED at the first ambient temperature. The plurality of optical measurements may generally include luminous flux and chromaticity, the plurality of electrical measurements may generally include induced photocurrents and forward voltages, and the calibration method steps may be repeated for each LED included within the illumination device and upon subjecting the illumination device to a second ambient temperature.