Light emitting diode (LED) lighting fixtures are presented that use a low-pass filter to smooth out or eliminate discrete, step changes in LED light fixture brightness, that may result from the use of digital brightness level settings. Because some lighting applications require a fast response to changes in the set brightness level, and some applications require a slower response, one set of examples use a switchable RC low-pass filter circuit, with two or more selectable RC time constant values. Another set of examples use a programmable resistance integrated circuit to achieve a more continuously-variable time constant, for greater flexibility in adjusting the response time of the LED lighting fixture, in response to user brightness inputs. The user is able to control the maximum rate of change of the LED light fixture's brightness, in response to changes in the brightness setting.

A method and an illumination system for simulating a CIE standard illuminant with a multi-channel LED are disclosed. The method includes adjusting a brightness of the main light source control channel, the wavelength complementary control channel, the color temperature adjustment control channel to make a mixed chromaticity coordinate meet a chromaticity coordinate of the CIE standard illuminant to be simulated according to chromaticity coordinates. The LED control channels are reduced through group optimization, and a technology which is discarded by multi-channel LED such as a filter is used, a control of a light source substantially reducing number of control channels and enabling a multi-channel LED to simulate a standard illuminant is formed, such that a single chromaticity control rather than a chromaticity control which must be transformed by a spectral conversion is achieved.

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.

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 (320) comprising at least one first light-emitting diode, LED, filament (100) adapted to emit light with a first correlated color temperature, CCT, and at least one second LED filament (200) adapted to emit light with a second, different, CCT. Each of the LED filaments is arranged to emit a first, larger, portion of light (112) from a first side (105), and a second, smaller, portion of light (114) from a second side (107). A longitudinal axis (A) extends from a base (322) of the lighting device to a top portion (330) of the envelope. Each of the at least one first LED filament is arranged at a first angle ( ) from the longitudinal axis, with its first surface generally facing towards the top portion of the lighting device, and each of the at least one second LED filament is arranged at a second angle ( ) from the longitudinal axis, with its first surface generally facing towards the base.

A lighting device (320) comprising at least one first light-emitting diode, LED, filament (100) adapted to emit light with a first correlated color temperature, CCT, and at least one second LED filament (200) adapted to emit light with a second, different, CCT. Each of the LED filaments is arranged to emit a first, larger, portion of light (112) from a first side (105), and a second, smaller, portion of light (114) from a second side (107). A longitudinal axis (A) extends from a base (322) of the lighting device to a top portion (330) of the envelope. Each of the at least one first LED filament is arranged at a first angle ( ) from the longitudinal axis, with its first surface generally facing towards the top portion of the lighting device, and each of the at least one second LED filament is arranged at a second angle ( ) from the longitudinal axis, with its first surface generally facing towards the base.

A lighting apparatus includes a rectifier, a 0-10 V dimmer converter, a power circuit and a light source. The rectifier for receives an AC power from an AC input to generate a DC current. The TRIAC wall switch is selectively coupled to the AC input. The TRIAC wall switch is operated by a user with an first manual operation to suppress a portion of the AC power from the AC input corresponding to the first manual operation. The 0-10 V dimmer converter is selectively coupled to a 0-10 V dimmer. The 0-10 V dimmer converts a dimmer voltage of the 0-10 V dimmer to a dimmer signal corresponding to a second manual operation of the user. The power circuit is coupled to the 0-10 V dimmer converter and the rectifier to convert the DC current to a set of driving current. The light source includes multiple LED modules.

A light emitting device (1) having a longitudinal axis (A) comprising at least one LED light source (8, 9) adapted for, in operation, emitting first light, at least one LED filament (4, 5, 6, 7) adapted for, in operation, emitting second light, at least one translucent core element (2), the translucent core element comprising a circumferential wall (3), an inner space (21) enclosed by the circumferential wall, and an outer bulb (13) enclosing the at least one translucent core element (2) and the at least one LED filament (4, 5, 6, 7), wherein the at least one LED light source (8, 9) being arranged in the inner space enclosed by the circumferential wall of the translucent core element, and the at least one LED filament (4, 5, 6, 7) being arranged outside of the at least one translucent core element, and wherein the at least one translucent core element (2) is centrally arranged on the longitudinal axis (A).

A controller (110) for a lighting system (100) is provided. The controller is connectable to a plurality of light sources (120, 122) of different colors and/or different color temperatures, and to a user control element (130) configured to generate a user selected value from a range of user selectable values. The controller is configured to receive a change of the user selected value, and as a response to and corresponding to this change adjust a combined output of the plurality of light sources to produce a change in output color, color temperature and/or luminous flux of a combined light of the plurality of light sources. The change is such that, as function of the user selected value in separate first intervals of the user selectable values, the output color and/or color temperature is kept approximately constant while the luminous flux obtains a local minimum or local maximum in each first interval. Similarly, in at least one second interval in between the first intervals, the output color at least changes from a first color to a second color and/or the color temperature increases or decreases while the luminous flux is kept approximately constant. A lighting system including the controller, and a method of operating a lighting system having such a controller are also provided.