A two-level LED security light includes a light emitting unit, a power supply unit, a loading and power control unit, a light sensing control unit, a motion sensing unit and a time setting unit. The lighting-emitting unit includes an LED load which may be turned on or turned off by the light sensing control unit and controlled by the loading and power control unit. When the motion sensing unit detects an intrusion, the LED load is switched to a high level illumination for a predetermined time length adjustable by the time setting unit. The LED load is configured with a plurality of LEDs accommodating to the power supply unit wherein a voltage V across each LED is confined in a range V.sub.th<V<V.sub.max, with V.sub.th being a minimum voltage to turn on the LED and V.sub.max a maximum voltage to avoid damaging the LED.

A LED security light includes a power supply unit further comprising a first power source and a second power source, a light sensing unit, a motion sensor unit, a loading and power control unit, a time setting unit and a light-emitting unit. The motion sensor is activated at dusk and is deactivated at dawn. When the first power source is used and when a motion intrusion is detected by the motion sensor, the LED security light generate a first level illumination for a short time duration. When the second power source is connected and when a motion intrusion is detected by the motion sensor, the LED security light generate a second level illumination for a short time duration. The time setting unit is for setting the time duration of the first level illumination or the second level illumination. The first power source is a solar power while the second power source is a backup battery.

A calibration method comprising, for each of one or more light sensors: (a) under influence of one or more substantially non-zero illumination levels in the target environment, using the light sensor to measure the sensed light level corresponding to each of these one or more illumination levels; (b) receiving a template light level value corresponding to each of the one or more illumination levels, representing the light level at a target location in the target environment substantially removed in space from the location of the light sensor, each of the one or more template light level values being assumed for the environment rather than measured by a light meter; and (c) determining a relationship between the sensed light level and the light level experienced at the target location, based on an evaluation of the one or more sensed levels relative to the one or more template light level values.

An image processing device includes a vision sensor and a processor. The vision sensor generates a plurality of events in which an intensity of light changes and generates a plurality of timestamps depending on times when the events occur. In addition, the processor may regenerate a timestamp of a pixel where an abnormal event occurs, based on temporal correlation of the events.

A two-level LED security light with a motion sensor. At night, the LED security light is turned on for a low level illumination. When the motion sensor detects any intrusion, the LED security light is switched from the low level illumination to a high level illumination for a short duration time and then returns to the low level illumination for saving energy. The LED security light includes a power supply unit, a light sensing control unit, a motion sensing unit, a loading and power control unit, and a lighting-emitting unit. The lighting-emitting unit includes one or a plurality of LEDs which may be turned on or turned off according to the sensing results from the light sensing control unit. When the motion sensing unit detects an intrusion, the LED security light can be immediately turned on to the high level illumination to scare away intruder.

A two-level LED security light within it has a light-emitting unit including an LED load which may be turned on or turned off by a loading and power control unit activated by a light sensing control unit and a motion sensing unit. When the motion sensing unit detects a motion signal, the light-emitting unit is switched to a high level illumination for a predetermined time length adjustable by a time setting unit, and then the loading and power control unit manages to turn off the light-emitting unit thru a soft off process. The LED load is configured with a plurality of LEDs accommodating to the power supply unit wherein a voltage V across each LED is confined in a range V.sub.th<V<V.sub.max, with V.sub.th being a minimum voltage to turn on the LED and V.sub.max a maximum voltage to avoid damaging the LED.

In one embodiment of the invention, a digital mirror is disclosed including an enclosure; a display device mounted in the enclosure to display images at a front side of the enclosure; an image capture device mounted in the enclosure adjacent the display device to reduce parallax error; lights mounted in the enclosure adjacent the display device; and a light diffuser mounted to the enclosure around the display device over the one or more lights. The one or more lights provide lighting in front of the display device and the image capture device captures images in the field of view in the front. The light diffuser diffuses and softens the light emitted by the one or more lights. Alternatively, the image capture device may be mounted on an articulated arm that may be used to capture and display various angles in the filed of view of the digital mirror.

A power control device is provided for adjusting the input power to a device. The power control device includes an input, an output, and two or more output levels. A device such as an electrical device, application, or tool is attached to the output of the power control device. Further, a switch couples the input of the power control device to a power source. Thereby, the output level of the power control device can be adjusted by turning on and turning off the power source within a period of time.

A fixture comprising a light sensor and an actuator for assigning the fixture to at least one zone. A fixture comprising a light source, a motion sensor and a light sensor. A fixture comprising a motion sensor, a light sensor and a wireless transmitter (optionally also a wireless receiver). A fixture configured to detect light brightness values over a time-span, and identify a period of time with smallest average brightness. A fixture configured to dim at a first rate when a motion sensor senses no motion for a designated period of time, and optionally also configured to brighten at a second rate when the motion sensor detects motion. A fixture configured to dim to not less than a designated percentage unless motion is detected during the dimming. A lighting control system, comprising fixtures and an actuator configured to assign fixtures to zones. Also, other lighting control systems and methods.

A calibration method comprising, for each of one or more light sensors: (a) under influence of one or more substantially non-zero illumination levels in the target environment, using the light sensor to measure the sensed light level corresponding to each of these one or more illumination levels; (b) receiving a template light level value corresponding to each of the one or more illumination levels, representing the light level at a target location in the target environment substantially removed in space from the location of the light sensor, each of the one or more template light level values being assumed for the environment rather than measured by a light meter; and (c) determining a relationship between the sensed light level and the light level experienced at the target location, based on an evaluation of the one or more sensed levels relative to the one or more template light level values.