A Light-Emitting Diode (LED) apparatus has a power source outputting a source DC power at a source DC voltage, a plurality of LEDs drivable at a driving DC voltage lower than the source DC voltage, and an electrical path connecting the power source to each LED for powering the LED by the power source. Each electrical path comprises a first portion connected to the power source at the source DC voltage and a second portion connected to the LED at the driving DC voltage, and the length of the first portion is longer than that of the second portion.

Systems, devices and methods are described herein. A device includes a power stage circuit, a switch and a first circuit. The switch is electrically coupled to the power stage circuit. The first circuit is electrically coupled to the power stage circuit and the switch and has a single output. The first circuit is configured to provide a first circuit output voltage at the single output. The first circuit output voltage has a first level on a condition that the power stage circuit is conducting at a peak current level. The first circuit output voltage has a second level on a condition that the power stage circuit is not conducting.

An LED device for use with an AC voltage power source configured such that at least one LED emits light during a positive phase of power provided from an AC power supply and at least one LED emits light during the negative phase of power provided from an AC power supply. The LED device includes a first power connection lead and a second power connection lead, both leads capable of being connected to and receiving power from an AC power supply.

A lighting unit for illuminating a habitat is provided. The lighting unit includes a housing and a light emitter. The operating parameters of the lighting unit may be adjusted to mimic different natural conditions.

The present disclosure relates generally to techniques for adjusting a light source to provide radiant energy having a particular spectral characteristic, and more particularly, to a system and method of selectively controlling and calibrating LEDs within a light fixture to produce radiant energy so that the light fixture emits light at a desired color.

Systems and methods for lighting fixture grouping and configuration in a distributed lighting system equipped with a wireless lighting network. An example method comprises: receiving, via a graphical user interface (GUI) rendered by a lighting network management application of a distributed lighting system, a command to associate a lighting fixture with a lighting fixture group; transmitting, to the lighting fixture, an update command specifying an identifier of the lighting fixture group and a value of a fixture configuration parameter; receiving, from the lighting fixture, an acknowledgement of the update command; incrementing a counter of lighting fixtures associated with the lighting fixture group; and displaying the counter in a visual association with a GUI element representing the lighting fixture group.

In one aspect, a device includes a processor, a communication interface accessible to the processor, and storage accessible to the processor. The storage bears instructions executable by the processor to identify an activity associated with a user. The instructions are also executable by the processor to use the communication interface to transmit at least one command to a light output apparatus to adjust light from the light output apparatus based on the identified activity.

A lighting device (100), comprising a light source (104) configured to be driven by electrical power, an energy-storage unit (106) configured to store electrical energy, to receive the electrical power from a power interface and to deliver the electrical power to the light source and to the power interface (108) allowing, in a connected state, an energy-transfer operation between the energy-storage unit (106) and an external second energy-storage unit (110) of an external electrically driven device (102) that can be connected to the power interface (108) and a control unit (116) configured to determine if the power interface (108) is in the connected state, to determine a current light-output state of the lighting device (100), and to control, in the connected state, the energy-transfer operation in an energy-transfer direction depending on the current light-output state of the lighting device (100).

The present invention discloses a light-emitting diode light string control system, which comprises: a switching unit having a power input end, a power output end, and a controlled end; the power output end is connected to the light-emitting diode light string; a control unit, and the control unit is connected to the controlled end of the switching unit; a second power generating unit, and the second power generating unit is connected to the light-emitting diode light string. According to the present invention, the light-emitting control command sent by the control unit is loaded on the power line of the light-emitting diode through a carrier wave mode to realize the driving of the brightness variation of the light-emitting diode light string, which saves costs and simplifies the control circuit of the light-emitting diode; the short-circuit protection unit detects whether the light-emitting diode is short-circuited in real time, has fast response rate to the protection of the light-emitting diode light string when it is short-circuited, fewer components are needed, the production cost is low, the circuit is simple, which is easy to implement, safe and reliable.

The present disclosure is a system that has a network comprising a power over ethernet switch and at least one light communicatively coupled to the network via the POE switch such that the at least one light receives power from the POE switch. Further, the system comprises a processor configured for transmitting power and light control data to the at least one light over the network via the POE, the light control data comprising commands for changing the color of the at least one light.