An illuminator includes: a light emitter including a light-emitting diode; a temperature sensor configured to detect a current temperature of the light emitter; and an illumination controller configured to adjust a drive voltage being supplied to the light emitter in accordance with the current temperature. The illumination controller includes a reference temperature storage in which a reference temperature is stored in advance and is configured to adjust the drive voltage by detecting the current temperature from the temperature sensor on a constant time cycle and comparing the current temperature with the reference temperature.

Methods and systems are provided for calibrating a UV lamp having a plurality of arrays or channels of light emitting diodes. The calibration involves adjusting a drive current applied to the UV lamp based on an actual irradiance output by its light-emitting diodes relative to a target irradiance. The calibration is selectively performed when a stabilized temperature condition of the lamp is met.

Methods and systems are provided for calibrating a UV lamp having a plurality of arrays or channels of light emitting diodes. The calibration involves adjusting a drive current applied to the UV lamp based on an actual irradiance output by its light-emitting diodes relative to a target irradiance. The calibration is selectively performed when a stabilized temperature condition of the lamp is met.

A light emitting apparatus has light emitting units. The light emitting units can be respectively provided with current densities, so that the light emitted by each of the light emitting unit has a light intensity, wherein the current densities are different from each other, or partial of the current densities are different from each other. A number of the light emitting units can be larger than or equal to four, all of the four lighting frequencies of the four light emitting units are different from each other, or partial of the four lighting frequencies of the four light emitting units are identical to each other, and the light emitting apparatus and the object under test rotate relative to each other. A light emitting method, a spectrum detection method and a lighting correction method are also illustrated for increasing SNR, correcting the light intensity or the spectrum signal.

A light emitting apparatus has light emitting units. The light emitting units can be respectively provided with current densities, so that the light emitted by each of the light emitting unit has a light intensity, wherein the current densities are different from each other, or partial of the current densities are different from each other. A number of the light emitting units can be larger than or equal to four, all of the four lighting frequencies of the four light emitting units are different from each other, or partial of the four lighting frequencies of the four light emitting units are identical to each other, and the light emitting apparatus and the object under test rotate relative to each other. A light emitting method, a spectrum detection method and a lighting correction method are also illustrated for increasing SNR, correcting the light intensity or the spectrum signal.

A lighting system for a motor vehicle with a pixelated light source having a plurality of selectively activatable elementary light sources is described. The activation of each elementary light source being controlled exclusively by a switch assigned to the elementary light source. A power converter designed to supply an electrical power to the pixelated light source and a controller designed to control the voltage supplied by the power converter and to control the switches controlling the activation of the elementary light sources. The lighting system also includes an electrical current sensor designed to measure the electrical current supplied by the power converter to the pixelated light source and to transmit information relating to said measured current to the controller.

A lighting system for a motor vehicle with a pixelated light source having a plurality of selectively activatable elementary light sources is described. The activation of each elementary light source being controlled exclusively by a switch assigned to the elementary light source. A power converter designed to supply an electrical power to the pixelated light source and a controller designed to control the voltage supplied by the power converter and to control the switches controlling the activation of the elementary light sources. The lighting system also includes an electrical current sensor designed to measure the electrical current supplied by the power converter to the pixelated light source and to transmit information relating to said measured current to the controller.

Systems and methods for monitoring, characterizing and controlling operation of LEDs are provided herein. Methods includes measuring a voltage across the LED, and correlating the voltage to a junction temperature of the LED. This correlation can be used to improve operation of the LED by increasing the signal to noise ratio of the LED signal, characterize the LED by comparing to an I-V curve, control LED operation to compensate for LED degradation and avoid crosstalk, and/or to generally improve performance and life expectancy of the LED. Improved performance of the LED can include stabilizing the photon output during performance of an assay to provide a desired dye reporter signal required for the assay and/or reducing an intra-shot during of the LED output during the assay. System and device with control units configured to perform these methods are also described herein.

An always-on lighting device having multiple power controllers is provided, which includes a first power controller, a first light source, a second power controller and a second light source. The first power controller and the second power controller execute an alternate mode. In the alternate mode, the first power controller keeps the first light source in on state within a predetermined time period. Then, the first power controller turns off the first light source after the predetermine time period passes and transmits a control signal to the second power controller, such that the second power controller keeps the second light source in on state within the predetermined time period.

The invention relates to a method for controlling a current to a light-emitting diode in order for it to emit a desired light flux, wherein the current is determined depending on a time period during which the light-emitting diode is supplied with current, in order to generate the desired light flux for said light-emitting diode.