A method and apparatus for determining a color and brightness of an LED, when the LED is biased with a current pulse. The apparatus includes a sensor having a plurality of filters and an output probe connected to the sensor, the output probe providing a color output and a brightness output in a single signal. The sensor may further include an input probe connected to the sensor providing power and a ground probe connected to the sensor providing a grounded connection to the sensor. The plurality of filters in the sensor are preferably configured in a matrix array of color receptors having different colors. The method of this invention utilizes pulsing/dynamic sampling to determine a frequency and/or a brightness of the LED output.

An illumination device described herein includes at least a phosphor converted LED, which is configured for emitting illumination for the illumination device, a first photodetector and a second photodetector. A spectrum of the illumination emitted from the phosphor converted LED comprises a first portion having a first peak emission wavelength and a second portion having a second peak emission wavelength, which differs from the first peak emission wavelength. The first photodetector has a detection range, which is configured for detecting only the first portion of the spectrum emitted by the phosphor converted LED. The second photodetector has a detection range, which is configured for detecting only the second portion of the spectrum emitted by the phosphor converted LED. Methods are provided herein for calibrating and controlling each portion of the phosphor converted LED spectrum, as if the phosphor converted LED were two separate LEDs.

In one aspect, luminaires are described herein having sensor modules integrated therein. In one aspect, a luminaire described herein comprises a light emitting face including a LED assembly. A sensor module is integrated into the luminaire at a position at least partially overlapping the light emitting face. In another aspect, a luminaire described herein comprises a LED assembly and a driver assembly. A sensor module is integrated into the luminaire along or more convective air current pathways cooling the LED assembly or driver assembly.

A lighting system includes at least one LED and at least one regulator in communication with the at least one LED. The at least one regulator is configured to supply a substantially constant current to the at least one LED while allowing a light output from the at least one LED to degrade over time towards a target minimum light output, and once the light output of the at least one LED is below the target minimum light output, increase current to the at least one LED to maintain the light output at the target minimum light output.

An illumination device and method is provided herein for calibrating individual LEDs in the illumination device, so as 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.

Various embodiments of methods and systems of proactive monitoring and metering of lighting devices are described herein. A light monitoring and metering system may include a specification database that stores the technical specification of the lighting device, a usage database that records the usage data of the lighting device, a data acquisition subsystem that obtains the identity of the lighting device in use, and a data processing subsystem that meters the usage or calculates the lumen output of the lighting device or the remaining lifetime of the driver of the light device.

An electronic apparatus is provided. The electronic apparatus includes a substrate including a plurality of electrodes in contact with at least part of electrodes of a plurality of micro LEDs disposed on a transparent substrate at a first pitch to apply a current to micro LEDs of the plurality of micro LEDs disposed at a second pitch, a camera disposed opposite to the substrate based on the transparent substrate, and a processor configured to apply a current to the plurality of electrodes on the substrate, control the camera to capture an image of the plurality of LEDs including a light emitting micro LED according to current applying, obtain characteristic information of the light emitting micro LED based on the captured image, and determine a target substrate on which each of the plurality of micro LEDs is disposed based on the obtained characteristic information.

The invention relates to an apparatus for irradiating an object, in particular for light-curing a dental object by means of a first radiation, the apparatus comprising at least one radiation source for emitting the first radiation, the apparatus further comprising at least one radiation sensor for measuring at least a second radiation, and the apparatus further comprising a housing. The second radiation is the first radiation reelected by the object.

A low-voltage alternating current-based LED light with built-in cooling and automatic or manual dimming. As it is self-cooled with fan failure protection, the light can be safely run in conditions that are near-hostile to its operation, with little possibility of damage. The light is movable along the XY axes of a grid system and can be either fixed in position in the Z axis or can be movable up and down the Z axis. The light can be equipped with either manual dimming using a standard potentiometer, or with automatic dimming via sensors and local network connectivity. The device prevents line-voltage electric shocks as the input voltage is low-voltage AC; in embodiments, about the same voltage as a doorbell, and the input current is 3 A. The device is also self-cooled, and will shut down if its fan is not running so as to prevent thermal overloads.

Systems and methods for testing a light emitting display unit having a plurality of light emitting elements are disclosed. Embodiments include a system with a test module, the test module including a plurality of light detection elements. Each of the plurality of light detection elements may generate a signal upon detection of light emitted from a light emitting element. The test module may also include a circuit. The circuit may receive input signals from the plurality of light detection elements, process the input signals based on a pre-determined function of the circuit, and generate an aggregate output signal based on the processing of the input signals. The circuit may also process the input signals based on discrete implementation of a combinational logic. The circuit may further receive instructions determining the combinational logic to be implemented.