The outdoor LED spotlight with motion sensor can be used for a wide range of applications. The most effective is its use at night in protected areas. The combined use of an LED spotlight for street lighting and a motion sensor can significantly save energy for owners of private houses. Emitting LEDs are switched on automatically only as needed.
Operation principle
Motion sensors that control the on/off of LED street lights can be infrared, ultrasonic or microwave. They can be built into a common armature together with the spotlight or have a separate swivel bracket. There are models that use remotesensors connected to the spotlight with an electric cable of a certain length.
Ultrasonic and microwave sensors use the Doppler effect. Ultrasonic detectors operate in the range from 20 to 60 kHz. Microwave sensors operate at a frequency of 5.8 GHz. In the absence of movement in the zone of their action, the frequencies of the wave emitted by the sensor and the wave reflected from the obstacle coincide. At the output of the control device there is a signal close to "zero". The spotlight is turned off.
When a moving object appears in the field of view, a "shift" of the frequencies of the emitted and reflected signal occurs. The control device generates a signal that turns on the LED street light.
Infrared or pyroelectric motion sensors capture dynamic temperature changes in their scanning area. The optical principle of tracking the change in temperature from its background value in the infrared wavelength range is used. Each change is registered by a pyroelectric sensor. At its output, a signal appears that controls the inclusion of a LED street spotlight with a motion sensor.
Features of each type of sensor
Motion sensors using the ultrasonic principle are unaffected by light and ambient temperature. They keep working in conditions of high humidity and dust. Stable triggering occurs when the object is abruptly moved. There is a probabilityskipping slow and smooth movements. The disadvantages include a short range, low sensitivity.
Microwave - microwave - sensors can operate in conditions that do not depend on ambient humidity, temperature and illumination. The sensors are highly sensitive and track minor movements. They are able to "see" objects behind non-metallic obstacles. But too high sensitivity often leads to false alarms. Sensors need to be fine-tuned after installation.
Infrared motion sensors are triggered by any dynamic change in ambient temperature. It can be both the result of detecting a moving object in the observation zone, and the influence of external extraneous factors: heat convection when objects are heated, precipitation in the form of raindrops. There is a high probability of false turning on of the LED spotlight.
Main Specifications
LED street spotlight with motion sensor is a combined instrument. It consists of an LED floodlight designed to illuminate the required area, and a motion sensor that determines the moment the lighting spotlight is turned on. Each of its components has technical characteristics of the LED street lighting spotlight.
The main characteristics of the LED spotlight include:
- power consumption, measured in watts (W), which determines the degree of illumination of the required area;
- radiated lightflux measured in lumens (Lm);
- the angle of dispersion of the light flux, determined by the structural elements;
- device supply voltage;
- color temperature;
- IP XY level of protection against dust and moisture.
When purchasing an LED street spotlight with a motion sensor, you need to know in advance the area of the territory required for lighting, the conditions in which the device will be used. It may be necessary to use multiple spotlights.
The main technical characteristics of the motion sensor are:
- sensitivity, which determines the range of detection of a moving object;
- maximum field of view;
- time interval that determines the time of the searchlight after the termination of the command to turn on from the sensor;
- the degree of illumination that determines the conditions for turning on the spotlight;
- operating temperature range.
The parameters of the time interval and the degree of illumination are set by the adjustment elements on the body of the motion sensor in accordance with the individual desires of the user.
Manual adjustments are made after the completion of installation work on the installation of a street LED spotlight with a light sensor.
Spotlight design
The main purpose of LED spotlights is to concentrate the light flux in a certain direction. This is achievedthe presence of a lens system of mirrors made of high-strength materials. The angle of the cone formed by them determines the area to be illuminated. To remove the heat generated during the operation of the LED matrix, the projectors are provided with a powerful metal finned radiator.
The front surface of the sensors is made of radio-transparent material. It does not interfere with scanning signals and signals reflected from objects. Inside the infrared detectors there is a system of Fresnel lenses, which focuses the thermal signal received from the object onto a system of pyroelectric sensors. The resulting signal controls the switching on / off of the LED spotlight.
Manual controls for IR sensor sensitivity, turn-off delay time and light level are located on the back of the sensor. The wall-mounted outdoor LED spotlight has a special mounting bracket for a vertical surface.
Applications
The use of LED street spotlights with motion sensors can significantly reduce energy consumption and save money on this. Their use is advisable in places of a single visit.
They are indispensable in the security systems of warehouses, garage cooperatives, car parks at night. In places of regular movement, their installation is not recommended. Frequent switching shortens the life of the spotlight's LED matrix.
Conclusion
MaterialThe article aims to acquaint the reader with devices that use the joint work of LED spotlights and motion sensors operating on different principles. The main parameters that determine the operation of such devices are given. Specific technical characteristics of LED street lighting spotlights are indicated in the documentation for each type of finished product. The reader, after reading the article, when purchasing the necessary device, will be able to talk with the seller in an understandable technical language for both.
