In one embodiment, an LED filament lamp for warm dimming is presented that includes a dimmable LED driver circuit; a first channel LED filament having a first forward voltage drop which emits a first white light of a first correlated color temperature; and a second channel LED filament having a second forward voltage drop and which emits a second white light of a second correlated color temperature warmer than the first correlated color temperature. In another embodiment, an LED filament for warm dimming lamps is presented that includes a light-transmissive substrate; at least one LED die and one non-light-emitting current regulator mounted thereon and connected in series; and an adhesive bead with fluorescent particles suspended therein affixed to the light-transmissive substrate, wherein illuminating the fluorescent particles with the at least one LED die causes the LED filament to emit white light of a predetermined correlated color temperature.

The embodiment of the present disclosure provides a lamp and a lighting control method thereof. The lighting control method includes: counting a lighting duration of N days before statistical date of a lamp, where N is an integer greater than 1 and less than 11; matching a to-be-executed dimming program from preset multiple dimming programs of the lamp according to a statistical result; and controlling an adaptive power supply of the lamp to switch to the to-be-executed dimming program, which improve the diversity of the lighting control of the lamp, increase the self-learning ability of the lamp, and reduce the maintenance cost of the lighting control of the lamp.

The embodiment of the present disclosure provides a lamp and a lighting control method thereof. The lighting control method includes: counting a lighting duration of N days before statistical date of a lamp, where N is an integer greater than 1 and less than 11; matching a to-be-executed dimming program from preset multiple dimming programs of the lamp according to a statistical result; and controlling an adaptive power supply of the lamp to switch to the to-be-executed dimming program, which improve the diversity of the lighting control of the lamp, increase the self-learning ability of the lamp, and reduce the maintenance cost of the lighting control of the lamp.

A lighting circuit makes use of a switch mode power converter to drive a solid state lighting arrangement having a lighting unit and a lighting control switch. A pulse width modulation control signal is applied to the lighting control switch for dimming control with an activation pulse during which the lighting unit is activated. The power converter delivers a triangular current waveform and the activation pulse is delayed until a predetermined point within the triangular current waveform. This ensures that the PWM pulse during which the lighting arrangement is turned on has timing which is synchronized with the timing of the switch mode power converter. The prevents beat frequencies so that visible flicker is avoided.

A lighting circuit makes use of a switch mode power converter to drive a solid state lighting arrangement having a lighting unit and a lighting control switch. A pulse width modulation control signal is applied to the lighting control switch for dimming control with an activation pulse during which the lighting unit is activated. The power converter delivers a triangular current waveform and the activation pulse is delayed until a predetermined point within the triangular current waveform. This ensures that the PWM pulse during which the lighting arrangement is turned on has timing which is synchronized with the timing of the switch mode power converter. The prevents beat frequencies so that visible flicker is avoided.

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.

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 single solid state luminaire product is field-configurable to a plurality of discrete coordinated color temperature (CCT) and/or maximum luminosity settings. A field-actuated control circuit may control a current ratio control circuit, which directs drive current from a power supply to selected ones, or in selected ratios to multiple ones, of heterogeneous LED strings. Additionally or alternatively the control circuit may control the power supply, to select an overall maximum level of drive current, which determines the maximum luminosity of the luminaire. Inputs for CCT and/or maximum luminosity are input to the field-actuated control circuit prior to the luminaire being removed from its product packaging. Embodiments allow a distributor to order and stock a large inventory of substantially identical luminaires from the manufacturer, yet still offer customers a variety of different CCT and/or maximum luminosity products.

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).

In one embodiment, a filament for LED filament lamp is presented, that includes a light-transmissive substrate; at least one LED die mounted on the light-transmissive substrate; and at least one current regulator mounted on the light-transmissive substrate, wherein the current regulator is connected in series with the at least one LED. In another embodiment, an LED filament lamp is presented, that includes a dimmable LED driver circuit; a first channel LED array with at least two LED die and a first forward voltage drop; and a second channel LED array with at least one LED dies and at least one current regulator to cause a second forward voltage drop of the second channel LED array to increase as current through the second channel LED array increases, wherein the second channel LED array is connected in parallel with the first channel LED array.