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.