A two-wire load control device (such as, a dimmer switch) for controlling the amount of power delivered from an AC power source to an electrical load (such as, a high-efficiency lighting load) includes a thyristor coupled between the source and the load, a gate coupling circuit coupled between a first main load terminal and the gate of the thyristor, and a control circuit coupled to a control input of the gate coupling circuit. The control circuit generates a drive voltage for causing the gate coupling circuit to conduct a gate current to thus render the thyristor conductive at a firing time during a half cycle of the AC power source, and to allow the gate coupling circuit to conduct the gate current at any time from the firing time through approximately the remainder of the half cycle, where the gate coupling circuit conducts approximately no net average current to render and maintain the thyristor conductive.

A two-wire load control device (such as, a dimmer switch) for controlling the amount of power delivered from an AC power source to an electrical load (such as, a high-efficiency lighting load) includes a thyristor coupled between the source and the load, a gate coupling circuit coupled between a first main load terminal and the gate of the thyristor, and a control circuit coupled to a control input of the gate coupling circuit. The control circuit generates a drive voltage for causing the gate coupling circuit to conduct a gate current to thus render the thyristor conductive at a firing time during a half cycle of the AC power source, and to allow the gate coupling circuit to conduct the gate current at any time from the firing time through approximately the remainder of the half cycle, where the gate coupling circuit conducts approximately no net average current to render and maintain the thyristor conductive.

Techniques for horticulture light are provided. A horticulture light can monitor at least one characteristic of a defined region in which at least one plant is planted in a horticulture environment in which horticulture light bulb is installed, determine at least one action for the horticulture light bulb to perform based on a state of the at least one characteristic and at least one objective of the installation of the horticulture light bulb in the horticulture environment, and execute the at least one action.

Techniques for horticulture light are provided. A horticulture light can monitor at least one characteristic of a defined region in which at least one plant is planted in a horticulture environment in which horticulture light bulb is installed, determine at least one action for the horticulture light bulb to perform based on a state of the at least one characteristic and at least one objective of the installation of the horticulture light bulb in the horticulture environment, and execute the at least one action.

Digital dimmer for varying the luminous intensity of an electronic light source, including an operation interface module, arranged for receiving a user command, and a control and processing module, arranged for modulating each half cycle of alternating current on the basis of the user command. If the user command is to turn on the electronic light source at a dimming value lower than 25%, the control and processing module modulates the alternating current at a first dimming value equal or higher than 30% in a given number of half cycles of the alternating current, wherein the duration of the given number of half cycles is not perceptible by the user's eye. Then, the control and processing module modulates the alternating current at a second dimming value lower than 25% to ensure that the user sees only that the electronic light source lights up at the second dimming value.

A configurable controllable under cabinet lighting fixture and system for controlling the same are provided. An example configurable controllable under cabinet lighting fixture includes one or more lighting elements positioned from a proximal end of a lighting fixture housing to a distal end of a lighting fixture housing. The example configurable controllable under cabinet lighting fixture further includes circuitry configured to control one or more first parameters associated with the one or more lighting elements. The circuitry is further configured to control one or more second parameters associated with one or more nearby configurable controllable under cabinet lighting fixtures located within a proximity threshold of the configurable controllable under cabinet lighting fixture. The lighting fixture housing is configured for affixing to a downward facing surface of a mounting surface.

A lighting system having multiple light sources is provided, which includes a first light source and a second light source. The first light source includes a first control module, a second memory module, a first lighting-emitting module and a first detection module. The second light source includes a second control module. When the first light source and the second light source are electrically connected to a power source, the first control module and the second control module turn off the first light source and the second light source respectively. The first control module reads the data of the first memory module of the first light source to determine whether the first light source malfunctions, and turns on the first light-emitting module when the first control module determines that the first light source does not malfunction. Then, the first detection module keeps detecting whether the first light source malfunctions.

A two-wire lighting control device, may include a controllably conductive device, a signal generation circuit, and a filter circuit. The controllably conductive device may apply an AC line voltage to a load, being conductive for a first duration of time and non-conductive for a second duration of time within a half-cycle of the AC line voltage. The signal generation circuit may generate a non-zero-magnitude signal. And, the filter circuit may receive a signal from the controllably conductive device during the first duration of time and the non-zero-magnitude signal from the signal generation circuit during the second duration of time. The non-zero-magnitude signal may, in effect, fill-in or complement the signal from the controllably conductive device, and any delay variation as a function of the firing angle of the controllably conductive device through the filter circuit may be mitigated by the presence of the non-zero-magnitude signal.

A two-wire lighting control device, may include a controllably conductive device, a signal generation circuit, and a filter circuit. The controllably conductive device may apply an AC line voltage to a load, being conductive for a first duration of time and non-conductive for a second duration of time within a half-cycle of the AC line voltage. The signal generation circuit may generate a non-zero-magnitude signal. And, the filter circuit may receive a signal from the controllably conductive device during the first duration of time and the non-zero-magnitude signal from the signal generation circuit during the second duration of time. The non-zero-magnitude signal may, in effect, fill-in or complement the signal from the controllably conductive device, and any delay variation as a function of the firing angle of the controllably conductive device through the filter circuit may be mitigated by the presence of the non-zero-magnitude signal.

A lighting control system includes a control group including a plurality of member devices which includes a power monitor and an emergency luminaire. The power monitor includes a power supply driven by a normal power source. The power monitor implements the following function. Transmit, via a wireless lighting control network, a normal power active message to the control group repeatedly at a predetermined time interval. The emergency luminaire includes an emergency light source to continuously emit illumination lighting during an emergency, and a power supply driven by an emergency power line. The emergency luminaire implements the following functions. Track an active message gap time. Reset the active message gap time after receiving the normal power active message. In response to the tracked active message gap time exceeding an active message timeout, enter an emergency mode active state by controlling the emergency light source to continuously emit the illumination lighting.