An automotive lamp includes a temperature-sensing element having an electrical state that changes according to the temperature T of a semiconductor light source, and a constant current driver that generates a driving current I.sub.LED that corresponds to the temperature T. The maximum value of the temperature differential of the driving current I.sub.LED in a first temperature range from a reference temperature T.sub.0 to a first temperature T.sub.1 (T.sub.1>T.sub.0) is smaller than the maximum value of the temperature differential of the driving current I.sub.LED in a second temperature range from the first temperature T.sub.1 to a second temperature T.sub.2 (T.sub.2>T.sub.1).

System and method for controlling one or more light emitting diodes. For example, the system for controlling one or more light emitting diodes includes a current regulation circuit coupled to a cathode of one or more light emitting diodes. The one or more light emitting diodes include the cathode and an anode configured to receive a rectified voltage. Additionally, the system includes a control circuit coupled to the cathode of the one or more light emitting diodes. The control circuit is configured to receive a first voltage from the cathode of the one or more light emitting diodes, compare a second voltage and a threshold voltage, and generate a control signal based at least in part on the second voltage and the threshold voltage. The second voltage indicates a magnitude of the first voltage.

System and method for controlling one or more light emitting diodes. For example, the system for controlling one or more light emitting diodes includes a current regulation circuit coupled to a cathode of one or more light emitting diodes. The one or more light emitting diodes include the cathode and an anode configured to receive a rectified voltage. Additionally, the system includes a control circuit coupled to the cathode of the one or more light emitting diodes. The control circuit is configured to receive a first voltage from the cathode of the one or more light emitting diodes, compare a second voltage and a threshold voltage, and generate a control signal based at least in part on the second voltage and the threshold voltage. The second voltage indicates a magnitude of the first voltage.

A method of increasing the color gamut of a multi-emitter light emitting device when dimming includes the steps of independently driving each emitter in the device, and increasing the lumen output of at least one emitter while simultaneously decreasing the lumen output of at least one other emitter, such that total color gamut increases while total lumen output of the light emitting device decreases. A light emitting device is also disclosed.

A method of increasing the color gamut of a multi-emitter light emitting device when dimming includes the steps of independently driving each emitter in the device, and increasing the lumen output of at least one emitter while simultaneously decreasing the lumen output of at least one other emitter, such that total color gamut increases while total lumen output of the light emitting device decreases. A light emitting device is also disclosed.

A grounded voltage protection circuit for a linear drive circuit includes an AC-DC power supply module, a first voltage protection module, an LED module, a drive IC and a linear current adjustment module. Through the cooperation of the first voltage protection module, the drive IC and the linear current adjustment module, when a DC voltage signal output by the AC-DC power supply module exceeds a first preset voltage value, the first voltage protection module outputs the first preset voltage signal to prevent the drive IC and the LED module from being damaged due to the overvoltage output by the AC-DC module, and avoid the transient impulse voltage in the entire voltage protection circuit, thereby enabling the voltage protection circuit to pass the CEC certification.

A grounded voltage protection circuit for a linear drive circuit includes an AC-DC power supply module, a first voltage protection module, an LED module, a drive IC and a linear current adjustment module. Through the cooperation of the first voltage protection module, the drive IC and the linear current adjustment module, when a DC voltage signal output by the AC-DC power supply module exceeds a first preset voltage value, the first voltage protection module outputs the first preset voltage signal to prevent the drive IC and the LED module from being damaged due to the overvoltage output by the AC-DC module, and avoid the transient impulse voltage in the entire voltage protection circuit, thereby enabling the voltage protection circuit to pass the CEC certification.

Techniques and architecture are disclosed for array of light emitting diodes. For example, the array may comprise a plurality of stages, each stage comprising a plurality of light emitting diodes (LEDs) connected to a floating switch, respectively. The LEDs may be arranged substantially linearly on a circuit board in a plurality of clusters, where a distance between adjacent LEDs within a cluster is smaller than a distance between LEDs in adjacent clusters. Adjacent clusters contain LEDs from different stages and each stage contains LEDs in different clusters. The array may be incorporated in a lighting system. The light system may have a closed loop feedback mechanism which directly detects light emitted from a subset of the LEDs and a controller which controls the array based on the detection.

Techniques and architecture are disclosed for array of light emitting diodes. For example, the array may comprise a plurality of stages, each stage comprising a plurality of light emitting diodes (LEDs) connected to a floating switch, respectively. The LEDs may be arranged substantially linearly on a circuit board in a plurality of clusters, where a distance between adjacent LEDs within a cluster is smaller than a distance between LEDs in adjacent clusters. Adjacent clusters contain LEDs from different stages and each stage contains LEDs in different clusters. The array may be incorporated in a lighting system. The light system may have a closed loop feedback mechanism which directly detects light emitted from a subset of the LEDs and a controller which controls the array based on the detection.

A linear drive circuit and an LED light including the same. The linear drive circuit includes an AC-DC module, an LED module, a CCT and brightness control module, and a drive control module. The AC-DC module is connected to the LED module through a first unidirectional conductive element, and is configured to obtain an AC input voltage control signal, and convert the AC input voltage control signal into a corresponding DC voltage control signal. The CCT and brightness control module is connected to the LED module, and is configured to obtain a corresponding CCT control signal or a brightness control signal according to the DC voltage control signal, so as to adjust the CCT of each LED string in the LED module. The drive control module is configured to receive the brightness control signal, thereby adjusting the brightness of the LED module.