A method and apparatus for a horticultural light that projects either a substantially uniform target illuminance onto a flat surface or an increasing target illuminance onto a flat surface. The horticultural light uses a refractor to receive the raw light distribution from one or more LEDs and then distributes an optically varied distribution having a minimized intensity at centerbeam with an increasing beam intensity as the beam width increases. The horticultural light utilizes both ultraviolet (UV) LEDs and non-UV LEDs arranged as an array to produce the optically varied distribution. A lens array is disposed in relation to the LED array and is comprised of UV compatible lenses and non-UV compatible lenses. A device may be disposed in relation to the UV compatible lenses to disallow incidence of UV radiation onto non-UV compatible lenses.

The present invention discloses an LED torchiere lamp with overheat and overvoltage protection functions. The LED torchiere lamp includes primarily a high-voltage rectifying circuit which rectifies high-voltage alternating current as high-voltage direct current, and an IC drive circuit. The IC drive circuit is built in with an electronic switching circuit to drive the LED lamp, an analog light dimmer circuit and a PWM light dimmer circuit, in addition to an overheat and overvoltage protection circuit which is used to improve the safety of and extend the lifetime of usage of the LED torchiere lamp, thereby having the practicality.

Disclosed herein is a lighting apparatus capable of uniformly maintaining power consumed by light emitting units even in the case in which various voltages are applied, and increasing power efficiency while minimizing a heating problem by adjusting a reference voltage applied to a connection structure of the light emitting units and a distribution switch according to magnitude of the applied voltage.

The invention relates to a device for operating LEDs, comprising a driver module and an LED module (11), which is controlled by the driver module (10) and has at least one LED. The LED module (11) is fed a current by the driver module (10) via a first connection (1), and a second connection (2) is present, preferably as a ground connection (GND). The device is characterized in that the LED module (11) is connected to the driver module (10) by means of a third connection (3), which is designed as a data channel, a voltage fed by the driver module (10) being applied to the data channel.

A linear light-emitting diode (LED)-based solid-state lamp comprising electric shock and arc prevention switches, thermal protection devices, and bi-pins at the opposite ends normally operates with either an electronic ballast or AC mains. When such a lamp is installed in or uninstalled from a lamp fixture with the bi-pins in lamp sockets, the electric shock and arc prevention switches with double controls can work with the electronic ballast to prevent an electric arc from occurring not only between the lamp sockets and the bi-pins but also between electrical contacts in the electric shock and arc prevention switches. Together with the thermal protection devices, the lamp eliminates any possible fire hazard associated with the electric arc while maintaining electric shock free for installers.

A lighting device includes a rectifier circuit, a driver circuit and a shunt circuit. The driver circuit is configured to apply respective voltage components contained in a pulsating voltage from the rectifier circuit every period of the pulsating voltage across part and all of solid light sources in response to the pulsating voltage and respective ON voltages of light source circuits including the part and all of the solid light sources. The shunt circuit is electrically connected in parallel with a light source circuit having a lowest ON voltage of the light source circuits, and configured to set a value of an output current from the rectifier circuit to a value proportional to a value of the pulsating voltage while the pulsating voltage is less than the lowest ON voltage.

The application relates to an over-temperature protection circuit of an LED driving power supply. The over-temperature protection circuit comprises a temperature detection circuit for sensing a temperature change; a switch control circuit connected to the output end of the temperature detection circuit and controlling the on-off of the circuit according to the output signal of the temperature detection circuit; a shunt circuit connected to an output end of the switch control circuit and shunting current when the switch control circuit is in an on state; a current detection circuit connected to an output end of the shunt circuit and changing a current detection signal according to an output current of the shunt circuit; the output end of the current detection circuit is connected with the feedback loop. The application has the advantages of low cost, stable performance, little environmental influence and high precision.

The application relates to an over-temperature protection circuit of an LED driving power supply. The over-temperature protection circuit comprises a temperature detection circuit for sensing a temperature change; a switch control circuit connected to the output end of the temperature detection circuit and controlling the on-off of the circuit according to the output signal of the temperature detection circuit; a shunt circuit connected to an output end of the switch control circuit and shunting current when the switch control circuit is in an on state; a current detection circuit connected to an output end of the shunt circuit and changing a current detection signal according to an output current of the shunt circuit; the output end of the current detection circuit is connected with the feedback loop. The application has the advantages of low cost, stable performance, little environmental influence and high precision.

An LED drive circuit includes a power supply terminal, an LED, a first switch, and a first resistor are connected in series. The power supply terminal, a third resistor, and a second switch are connected in series. A connection point between the third resistor and the second switch, and a control terminal of the first switch are connected. A second resistor is connected between a connection point between the first switch and the first resistor, and a control terminal of the second switch. A first PTC thermistor is connected to a connection point between the control terminal of the second switch and the second resistor.

An LED drive circuit includes a power supply terminal, an LED, a first switch, and a first resistor are connected in series. The power supply terminal, a third resistor, and a second switch are connected in series. A connection point between the third resistor and the second switch, and a control terminal of the first switch are connected. A second resistor is connected between a connection point between the first switch and the first resistor, and a control terminal of the second switch. A first PTC thermistor is connected to a connection point between the control terminal of the second switch and the second resistor.