A PWM dimmer includes a source terminal, a load terminal, a power stage, an interface, and control circuitry. The power stage is coupled between the source terminal and the load terminal and is configured to receive from the source terminal an AC supply signal and provide a pulsed AC load signal to the load terminal in response to a control signal. The AC supply signal has a sinusoidal envelope with a positive half-cycle and a negative half-cycle for each cycle. The pulsed AC load signal tracks the envelope and includes a plurality of pulses in the positive half-cycle and the negative half-cycle for each cycle. The interface is configured to receive dimming control information bearing on a dimming level from a user or remote terminal. The control circuitry is configured to receive the dimming control information from the interface and generate the control signal based on the dimming control information.

A flash LED package includes a substrate; a flash LED device in a first region of an upper surface of the substrate, and including first to fourth LED light sources that emit white light, blue light, green light, and red light, respectively; an optical sensor in a second region of the upper surface of the substrate, and having a light receiving region that detects a correlated color temperature; and a lens cover on the substrate to cover the flash LED device and the optical sensor, and having a lens unit in a region overlapping the first to fourth LED light sources.

A flash LED package includes a substrate; a flash LED device in a first region of an upper surface of the substrate, and including first to fourth LED light sources that emit white light, blue light, green light, and red light, respectively; an optical sensor in a second region of the upper surface of the substrate, and having a light receiving region that detects a correlated color temperature; and a lens cover on the substrate to cover the flash LED device and the optical sensor, and having a lens unit in a region overlapping the first to fourth LED light sources.

There is provided a lens for a light emitter which includes: a bottom surface; an incident surface connected to the bottom surface at a central region of the bottom surface and disposed on or above a light source to allow light emitted from the light source to be made incident thereto and travel in an interior of the lens; and an output surface connected to the bottom surface at an edge of the bottom surface and configured to allow the light which has traveled in the interior of the lens to be emitted outwardly therefrom, wherein the central region of the bottom surface protrudes with respect to the other region of the bottom surface.

Method of controlling light output (44) of a luminaire (40) using a control terminal (30), wherein the luminaire comprises at least one light source (46) and a control unit (42), the control terminal comprising a display. The method comprises the steps of sending, from the control terminal to the control unit, an interrogation (T1) of light output adjustment ability of the luminaire, receiving, from the control unit to the control terminal, information (T2) of light output adjustment ability of the luminaire wherein the information comprises at least three input values representing coordinates in a chromaticity diagram and defining an adjustment area in the chromaticity diagram, evaluating the information of light output adjustment ability from the luminaire, and displaying, on the display (32) of the control terminal, a light output control (50, 60), for adjustment of the color or color temperature of the luminaire, the light output control being single-variable or multi-variable depending on the evaluation of the information of light output adjustment ability received from the control unit.

The present disclosure discloses a method of combining light, an intelligent terminal and a storage medium. The method includes: according to a current sampling temperature, determining corresponding relationship between control degree and illuminance of each of LEDs at the current sampling temperature; according to a target light combining value and the corresponding relationship between the control degree and the illuminance of each of the LEDs at the current sampling temperature, determining control degree of each of the LEDs at the current sampling temperature; according to the control degree of each of the LEDs at the current sampling temperature, controlling each of the LEDs to combine light.

The present disclosure discloses a method of combining light, an intelligent terminal and a storage medium. The method includes: according to a current sampling temperature, determining corresponding relationship between control degree and illuminance of each of LEDs at the current sampling temperature; according to a target light combining value and the corresponding relationship between the control degree and the illuminance of each of the LEDs at the current sampling temperature, determining control degree of each of the LEDs at the current sampling temperature; according to the control degree of each of the LEDs at the current sampling temperature, controlling each of the LEDs to combine light.

A system allows a light fixture to have a wider range of color temperatures (CCT) while limiting the warmest temperature reached at full intensity. The CCT of the light output may be controlled independently of intensity across a certain range of CCT and dependent on intensity across another range. In an implementation, both intensity and CCT may be adjusted from a single handle, where the interface positions may be divided into multiple zones. In another implementation, intensity may be adjusted from a first handle, while CCT may be adjusted from a second handle. The CCT of the light output may be limited to cooler levels when the intensity is higher, and/or the intensity of the light may be limited to lower levels when the CCT is warmer.

The present disclosure provides methods and structures for controlling characteristics of light being projected from a light source. In one embodiment, the method includes selecting a color setting of light to be projected by a light engine having at least one light emitting diode; and monitoring temperature of the light engine with a thermistor. The changes in resistance measurements taken from the thermistor are correlated to changes in the temperature of the light engine. The method for controlling characteristics of light being projected from the light source may further include setting characteristics of the electrical signal to energize the light emitting diodes of the light engine to provide the color setting selected at the temperature of the light engine measured using the thermistor.

The present disclosure provides methods and structures for controlling characteristics of light being projected from a light source. In one embodiment, the method includes selecting a color setting of light to be projected by a light engine having at least one light emitting diode; and monitoring temperature of the light engine with a thermistor. The changes in resistance measurements taken from the thermistor are correlated to changes in the temperature of the light engine. The method for controlling characteristics of light being projected from the light source may further include setting characteristics of the electrical signal to energize the light emitting diodes of the light engine to provide the color setting selected at the temperature of the light engine measured using the thermistor.