Motion sensor 38w led area light
The most important feature of LEDs for illumination is the function of directional emission of light, because power LEDs are almost always equipped with reflectors, and the efficiency of such reflectors is significantly higher than the reflector efficiency of the lamps.
In addition, the efficiency of the self-reflector has been included in the LED efficacy detection. Road luminaires using LEDs should utilize the characteristics of directional emitted light of LEDs as much as possible, so that each LED in the road luminaire directly directs the light to each area of the illuminated road surface, and then uses the auxiliary light distribution of the luminaire reflector to realize Very reasonable light distribution for road lamps.
It should be said that the road lamps should meet the requirements of illumination and illumination uniformity of CJJ45-2006 and CIE31 and CIE115 standards. The function of three light distributions in the lamps should be better. The LED with reflector and reasonable beam output angle has a good primary light distribution function.
In the luminaire, a good secondary light distribution function can be realized by designing the mounting position of each LED and the direction of the emitted light according to the height of the road lamp and the width of the road surface. Reflectors in such luminaires are only used as an auxiliary three-time light distribution to ensure better uniformity of road illumination.
Motion detector is a device that detects moving objects, particularly people. Such a device is often integrated as a component of a system that automatically performs a task or alerts a user of motion in an area. They form a vital component of security, automated lighting control, home control, energy efficiency and other useful systems.
An electronic motion detector contains an optical, microwave, or acoustic sensor, and in many cases a transmitter for illumination. However, a passive sensor senses a signature only from the moving object via emission or reflection, i.e., it can be emitted by the object, or by some ambient emitter such as the sun or a radio station of sufficient strength. Changes in the optical, microwave, or acoustic field in the device's proximity are interpreted by the electronics based on one of the technologies listed below. Most low-cost motion detectors can detect up to distances of at least 15 feet (4.6 m). Specialized systems cost more, but have much longer ranges. Tomographic motion detection systems can cover much larger areas because the radio waves are at frequencies which penetrate most walls and obstructions, and are detected in multiple locations, not only at the location of the transmitter.
Motion detectors have found wide use in domestic and commercial applications. One common application is activating automatic door openers in businesses and public buildings. Motion sensors are also widely used in lieu of a true occupancy sensor in activating street lights or indoor lights in walkways, such as lobbies and staircases. In such smart lighting systems, energy is conserved by only powering the lights for the duration of a timer, after which the person has presumably left the area. A motion detector may be among the sensors of a burglar alarm that is used to alert the home owner or security service when it detects the motion of a possible intruder. Such a detector may also trigger a security camera to record the possible intrusion.