There is disclosed alighting device (8) comprising: at least one light-emitting filament comprising (12) a plurality of solid-state light sources (14); and an elongated reflector (9) arranged to reflect light emitted by the light-emitting filament (12), wherein the reflector (9) has a longitudinal groove (11) in which the light-emitting filament (12) is arranged such that the reflector (9) and the at least one light-emitting filament (12) extend longitudinally along a common path, and wherein said path is curved in three dimensions. A light bulb (5) comprising the lighting device (8) and a luminaire (1) comprising the lighting device (8) are also disclosed. The lighting device (8) can be produced cost-efficiently and adapted to conform well to a predetermined emission pattern.

A lighting apparatus includes a first electrode, a second electrode, a lighting source, a rectifier, a driver and an electric shock prevention circuit. The first electrode and the second electrode receive an external power source. The external power source is either an alternating current or a direct current. The light source has multiple LED modules. The rectifier is used for rectifying the external power source to a rectified power. The driver is used for converting the rectified power to a driving current supplying to the light source.

A lighting apparatus includes a first electrode, a second electrode, a lighting source, a rectifier, a driver and an electric shock prevention circuit. The first electrode and the second electrode receive an external power source. The external power source is either an alternating current or a direct current. The light source has multiple LED modules. The rectifier is used for rectifying the external power source to a rectified power. The driver is used for converting the rectified power to a driving current supplying to the light source.

An LED lamp (1) for use in a luminaire (2), the LED lamp (1) comprising a plurality of LEDs (14) connected in a plurality of groups (15, 16); one or more rectifier circuits (10, 10a, 10b) adapted for rectifying an electrical current received from the luminaire (2) for supply to the LEDs (14); a first control circuit (24) adapted to estimate electrical current or electrical power received by or used by the LED lamp (1), and adapted to generate an output on the basis of the estimate; and a switching circuit (20) comprising a first switch (21) for switching the plurality of groups of LEDs (15, 16) between a plurality of different circuit configurations at a switching frequency of at least 300 kHz and according to a duty cycle; wherein the switching circuit (20) is configured to adjust the duty cycle in dependence on the output of the first control circuit (24) to adjust the electrical power used by the LED lamp (1).

An LED lamp (1) for use in a luminaire (2), the LED lamp (1) comprising a plurality of LEDs (14) connected in a plurality of groups (15, 16); one or more rectifier circuits (10, 10a, 10b) adapted for rectifying an electrical current received from the luminaire (2) for supply to the LEDs (14); a first control circuit (24) adapted to estimate electrical current or electrical power received by or used by the LED lamp (1), and adapted to generate an output on the basis of the estimate; and a switching circuit (20) comprising a first switch (21) for switching the plurality of groups of LEDs (15, 16) between a plurality of different circuit configurations at a switching frequency of at least 300 kHz and according to a duty cycle; wherein the switching circuit (20) is configured to adjust the duty cycle in dependence on the output of the first control circuit (24) to adjust the electrical power used by the LED lamp (1).

A light emitting apparatus includes a housing, a connector, a light source, a control module board, and an antenna. The housing includes an inner space. The light source is located in the inner space. The control module board is located in the connector, wherein an accommodation space is formed by the housing and the control module board. The antenna is located in the accommodation space.

A 2-Wire LED dimming system and method re-purposes existing 120V AC architecture and hardware to carry low voltage PWM gradient DC power to the LED lamps provides a consistent gradation over a 0-100% dimming range. An LED Driver is electrically connected to an AC power source and connect to at least one LED lamp. The AC power source is electrically connected to an AC to DC converter where the AC power is converted to filtered and regulated DC power for the control unit and the power switch. The power switch is electrically connected to the AC to DC converter DC power output. The control unit is electrically connected to the power switch which is turned ON or OFF according to the pulse width modulation PWM signal from the control unit in order to connect or disconnect the DC power from the AC to DC converter.

One or more devices of a lighting control system may be configured to generate a custom CCT dimming curve for a lighting load. The device may receive, via a user selection, a high-end correlated color temperature (CCT) value, where the high-end CCT value is associated with a high-end intensity level of the lighting load. The device may receive, via a user selection, a CCT dimming curve from a plurality of selectable curve shapes. The device may determine a bend value and a CCT range based on the selected curve shape. The device may determine a low-end CCT value based on the high-end CCT value and the CCT range, where the low-end CCT value is associated with a low-end intensity level of the lighting load. The device may determine the custom CCT dimming curve based on the high-end CCT value, the low-end CCT value, and the bend value.

A lighting device may include a light source, a plurality of drive circuits, and a control circuit. The light source may include a plurality of emitter circuits that are configured to emit light. The light source may include a first emitter circuit that is configured to emit light at a first color (e.g., color temperature), a second emitter circuit is configured to emit light at a second color (e.g., color temperature), and a third emitter circuit is configured to emit light at a third color (e.g., color temperature). The first, second, and third colors (e.g., color temperatures) may be on a color curve, such as a color temperature curve like the black body locus. The control circuit may be configured to control the amount of power delivered to no more than two emitter circuits to emit light when controlling the light emitted by the light source to the target intensity.

A lighting device (1000; 1; 2) having at least one semiconductor light source (1040) and at least one electrical resistance element (1020) which comprises at least one coiled filament (1021), the at least one resistance element (1020) being connected in series with the at least one semiconductor light source (1040).