The present application discloses a light-emitting element comprising a semiconductor light-emitting stack emitting a first light which has a first color coordinate, a first wavelength conversion material on the semiconductor light-emitting stack converting the first light to emit a second light, and a second wavelength conversion material on the first wavelength conversion material converting the second light to emit a third light. The first light and the second light are mixed to be a fourth light having a second color coordinate. The third light and the fourth light are mixed to be a fifth light having a third color coordinate, and the second color coordinate locates at the top right of the first color coordinate and the third color coordinate locates at the top right of the second color coordinate.

Described herein is a method and a device for monitoring radiation emitted by a radiation emitting element of a thermal radiation source within the visible and the infrared spectral ranges, specifically for determining an emission spectrum of the thermal radiation source. The method includes the following steps: a) providing a thermal radiation source including a radiation emitting element; b) providing at least one radiation sensitive element; c) measuring a spectral radiance of the radiation emitted by the radiation emitting element at at least two individual wavelengths; and d) determining an emission temperature of the radiation emitting element by providing a ratio of the measured values of the spectral radiance of the radiation at the at least two individual wavelengths.

Aspects of the disclosure relate to an electronic device, a method and an apparatus for measuring color temperature of ambient light, and a storage medium. The electronic device can include a display screen, a first color temperature sensor and a second color temperature sensor that are arranged side by side under the display screen, and a filter element that is located between the second color temperature sensor and the display screen to filter ambient light incident on the second color temperature sensor. The device can further include a processing element that is connected with the first color temperature sensor and the second color temperature sensor respectively to determine ambient light color temperature of an environment where the electronic device is located according to a first color temperature signal value detected by the first color temperature sensor and a second color temperature signal value detected by the second color temperature sensor.

An optical sensing method and an optical sensor module thereof. The optical sensing method includes obtaining an optical signal by sensing with a first optical sensor and a second optical sensor, respectively. The first optical sensor and the second optical sensor have different optical sensing wavelength ranges. Furthermore, a color temperature determination unit receives the optical signals of the first and second optical sensors and calculates a color temperature value by substituting an equation. In this way, the optical sensing method and its optical sensor module can obtain color temperature calculations with high accuracy and can effectively reduce the system computational complexity.

An infrared camera captures a subject to generate a thermal image thereof. A distance sensor detects distances from an information processing apparatus to points on the subject. A storage device stores a temperature-to-color conversion table indicative of correspondences between temperatures and pixel colors. A control device processes the thermal image based on the conversion table, to display the processed thermal image on a display device. The control device identifies a region of interest within a range of a predetermined distance from a reference point of the subject based on the distances detected by the distance sensor, sets lower and upper limits of a temperature range based on temperatures of points within the region of interest, updates the conversion table based on the lower and upper limits, and regenerates the thermal image based on the updated conversion table, to display the regenerated thermal image on the display device.

Some embodiments include a method of operating a tunable light module. The method can include driving a lamp in the tunable light module, having lamps of at least two colors, to produce a colored light according to the color mixing plan that corresponds to a correlated color temperature (CCT); measuring a light characteristic of the lamp using a light sensor; detecting a degradation level by comparing the measured light characteristic against an expected light characteristic; and adjusting a current level for driving the lamp at the CCT by referencing the color mixing plan and an alternative coefficient corresponding to the degradation level.

Some embodiments include a method of operating a tunable light module. The method can include driving a lamp in the tunable light module, having lamps of at least two colors, to produce a colored light according to the color mixing plan that corresponds to a correlated color temperature (CCT); measuring a light characteristic of the lamp using a light sensor; detecting a degradation level by comparing the measured light characteristic against an expected light characteristic; and adjusting a current level for driving the lamp at the CCT by referencing the color mixing plan and an alternative coefficient corresponding to the degradation level.

A luminaire comprises at least one light emitting diode (LED) as a light source. Such LED comprises a limited light emitting angle for the emitted light radiation. Outside of the light emitting angle, an infrared sensor is assigned to the light source for detecting its temperature.

An intelligent endoscopic light source system for controlling the intensity of a light source, including a light source emitting light at a first intensity, an attenuator positioned to receive light from the light source at a first intensity and movable to pass light from the light source at a second intensity, a sensor mounted to the attenuator for measuring the first intensity, and a controller for receiving the intensity measurement from the sensor and moving the attenuator to pass light at a desired second intensity.

A luminaire comprises at least one light emitting diode (LED) as a light source. Such LED has a limited light emitting angle for emitted light radiation. An infrared sensor is assigned to the light source for determining the temperature of same.