A plant cultivation device includes a light source unit having a first light source emitting stimulation light in a UV region toward a plant and a second light source emitting background light toward the plant, the background light having a different peak wavelength than the stimulation light. The second light source emits the background light during a light period and stops emission of the background light during a dark period. In addition, the first light source emits the stimulation light for a certain period of time during the light period. Further, a cumulative amount of the stimulation light emitted from the first light source is 0.036 J or more per day.

An integrated ceiling device includes a housing retaining an electronic assembly, a heat sink having a central opening, a light source coupled onto the heat sink, the housing is coupled with and disposed at least partly above the heat sink, and a central vertical axis of the housing aligns or is in proximity with the central opening of the heat sink.

An integrated ceiling device includes a housing retaining an electronic assembly, a heat sink having a central opening, a light source coupled onto the heat sink, the housing is coupled with and disposed at least partly above the heat sink, and a central vertical axis of the housing aligns or is in proximity with the central opening of the heat sink.

A load controller in a load control system may communicate messages with load control devices for controlling electrical loads. The load controller may receive messages that comprise values for controlling different load control parameters over different overlapping fade times. The load controller may identify a shorter remaining fade time for controlling one of the load control parameters and may determine an updated target value for controlling another load control parameter over the shorter remaining fade time. The load controller may transmit a series of messages within a limited fade time using an updated target value for each message to control an electrical load at a fade rate that during a fade time that is longer than the limited fade time.

A load controller in a load control system may communicate messages with load control devices for controlling electrical loads. The load controller may receive messages that comprise values for controlling different load control parameters over different overlapping fade times. The load controller may identify a shorter remaining fade time for controlling one of the load control parameters and may determine an updated target value for controlling another load control parameter over the shorter remaining fade time. The load controller may transmit a series of messages within a limited fade time using an updated target value for each message to control an electrical load at a fade rate that during a fade time that is longer than the limited fade time.

The present disclosure provides a lighting device including a first lighting unit including a plurality of first light sources arranged on a first flat or curved surface, and configured to implement lighting of a first illuminance and of a first color, a second lighting unit including a plurality of second light sources arranged on a second flat or curved surface at least partially inclined with respect to the first lighting unit, the second lighting unit surrounding at least a part of the first lighting unit, and configured to implement lighting of a second illuminance at least partially different from the first illuminance and of a second color, at least one opening formed to penetrate through the first lighting unit, and at least one third lighting unit including a plurality of third light sources arranged on a third flat or curved surface, and configured to implement lighting of a third illuminance higher than the first illuminance and of a third color through the opening. The second lighting unit may be configured to implement the lighting of the second illuminance and the second color in conjunction with the third lighting unit.

A method of automatically sequencing an LED light string. The LED light string includes a plurality of LED modules. The method includes steps of: (a) building a start reference time before the LED modules start to operate, (b) generating a plurality of time difference values from the start reference time when a working voltage of each of the LED modules rises to an identification voltage after the LED modules operate, (c) determining the sequence of the LED modules according to the time difference values to achieve an automatic sequencing function.

A lighting system includes a plurality of lighting fixtures and a terminal device—that controls the plurality of lighting fixtures, wherein: each of the plurality of lighting fixtures transmits, to the terminal device, identification information and acquired information; and the terminal device classifies the plurality of lighting fixtures—on the basis of the information acquired respectively by the plurality of lighting fixtures.

A lighting system includes a plurality of lighting fixtures and a terminal device—that controls the plurality of lighting fixtures, wherein: each of the plurality of lighting fixtures transmits, to the terminal device, identification information and acquired information; and the terminal device classifies the plurality of lighting fixtures—on the basis of the information acquired respectively by the plurality of lighting fixtures.

A lighting device, such as a two-wire lighting control device, may include a controllably conductive device and a control circuit. The controllably conductive device may supply an AC line voltage to a load in response to a dive signal such that the controllable conductive device is non-conductive for a first duration of time and conductive for a second duration of time within a half-cycle of the AC line voltage. The control circuit may receive a signal from the controllably conductive device that represents a voltage developed across the controllable conductive device during the first duration of time. The control circuit may generate a sine-wave-shaped signal that complements the voltage developed across the controllably conductive device during the second duration of time. The control circuit may also filter the signal from the controllably conductive device during the first duration of time and the sine-wave-shaped signal during the second duration of time.