Some devices have been invented and developed only in order for us to save electricity. Such devices include light regulators, motion sensors and twilight switches. Switches with light regulators are designed to change the degree of light in the room. This device smoothly regulates the brightness of the light bulb. Such switches create a pleasant atmosphere in the room. In addition, they are economical, as they reduce the costs of lighting and extend the life of the lamp due to the supply of reduced voltage to it.
Movement sensors consist of a combination of an electronic switch and infrared radiation detector. This device reacts to the appearance of a person in the room and turns on the light itself. Movement sensors are able to recognize only moving objects.
Twilight switches consist of a light sensor and a control relay. In this device, the level of illumination is set and when it falls, the sensor signals on the relay that turns on the lighting. If the illumination exceeds this level, then at the signal of the relay sensor will turn off the lighting. You can combine the motion sensor and light sensor, then the light will turn on in the room when a person appears and dusk at dusk.