A light unit includes a DC/DC converter. A plurality of unit light emitting diode columns receive a voltage applied from the DC/DC converter. A plurality of transistors, respectively, are connected to the plurality of unit light emitting diode columns. A current deviation compensating unit compensates for deviations between currents respectively flowing through the plurality of unit light emitting diode columns by a pulse current width modulation average current control method. A connection switch sequentially connects the current deviation compensating unit with the plurality of transistors. A resistor is connected to output terminals of the plurality of transistors. A switch controller controls connection between the connection switch and the current deviation compensating unit based on a signal applied to the resistor.

An LED driver circuit capable of overcoming the issues in that a brightness change is perceived as a stepped change in a very low light amount region or light abruptly goes out by using PWM control and of realizing smooth dimming even at a very low amount of light is provided. In the LED driver circuit, a first circuit including a first resistor and a first power transistor connected in series and a second circuit including a second resistor and a second power transistor connected in series are connected in parallel with each other and are connected to an LED. First and second PWM signal generator circuits drive the first and second power transistors, respectively. When the first and second power transistors are in an on-state, currents flow through the LED via the first and second resistors, respectively, which enable a smooth brightness change even in a low illuminance region.

Battery charge function may be in an LED driver which eliminates the duplication of line interface circuitry. A single line interface circuit provides the input power conversion for both the battery charge function and normal operation of the LED driver. During a loss of power, the LEDs may be controlled using power from the battery backup module.

A solid state lighting module is disclosed. In one example, the module comprises a light source and a resistor circuit, wherein an output resistance of the resistor circuit is for conveying to a connected driver information on a desired power to be applied to the solid state light source. A control interface is provided for receiving configuration information from an external configuration device and a control circuit configures the resistor circuit thereby to set the output resistance in response to received configuration information. This approach involves integrating the configuration function in the lighting module instead of in the driver. The output resistance can be determined by existing driver architectures without modification, while at the same time the ability of the user to tailor individual lighting modules to their needs is enabled.

An apparatus for controlling a backlight is disclosed. The apparatus includes a housing and door. A transparent liquid crystal display and associated backlight is positioned between front and rear glass panels of said door. A door sensor is positioned to detect if the door is open or shut, and a controller connected to the backlight and door sensor measures the amount of time that has passed between door openings and drives the backlight at various levels based upon the elapsed time.

Embodiments relate to a lighting device that includes or retains a plurality of solid-state light emitters and is capable of providing one or more of omni-directional lighting and task lighting. Other embodiments relate to modular lighting systems for providing the same.

Emergency light devices, systems and methods that provide instant light in a power outage or other situations. One or more sensors monitor the flow of electricity, and when the flow of electricity is stopped or no longer present, an emergency light device power monitoring device instantly communicates via wireless communication technology to emergency light device(s) to instantly turn on the emergency light device(s). The emergency light device(s) can be a portable and/or permanent unit of varying shapes and sizes, and can be attached to any object, or may stand alone, with some or all of its parts being replaceable, interchangeable, or upgradeable.

An apparatus comprising a communication circuit and a processing circuit. The communication circuit may be configured to connect to a network based on a communications protocol. The processing circuit may be configured to control a light based on a pre-defined condition. The processing circuit may determine a location of the apparatus based on an identifier. The processing circuit may synchronize to a universal clock via the network. The processing circuit may determine a local time based on (a) the universal clock and (b) the location, both received from a device connected to the apparatus through the network. The processing circuit may receive input from the device. The processing circuit may calculate the pre-defined condition based on (a) the local time and (b) the input from the device. The processing circuit may determine whether the pre-defined condition has been met.

A toilet seat lighting apparatus 10 is provided so that and individual can enter a bathroom at night to use the toilet 12 which provides light and allows the user to determine if the toilet seat 20 is up or down without turning on the bathroom light. The apparatus is provided with a motion sensor circuit 30 which detects motion when an individual enters the bathroom and a pressure sensor circuit 40 which is activated by the motion sensor circuit. Once the pressure sensor circuit 40 is activated it will activate switch 72 which in turn will illuminate a red light 26 to indicate the toilet seat 20 is down or a green light 28 to indicate the seat 20 is up.

This invention is a photon-interactive Gaussian surface lens method means that converts incident photons from a single or a plurality of wide band gap semiconductor class light emitting diode dies, into a secondary emission of photons emanating from a composite photon transparent colloidal stationary suspension of quantum dots, high efficiency phosphors, a combination of quantum dots and high efficiency phosphors and nano-particles of metal, silicon or similar semiconductors from the IIIB and IVB Group of the Periodic Table and any nano-material and/or micro/nano spheres that responds to Rayleigh Scattering and/or Mie Scattering; and a plurality of quantum dots in communication with said nano-particles in said suspension. The apparatus and methods according to the present invention provides in improved narrow pass-band of red, green, and blue photon efficiency over phosphor based conversion. Utilizing the invention's methodology, the white resultant colour temperature is stabilized against internal semiconductor thermal fluctuations or ambient thermal variations.