Power indicator lights belong to the lighting industry and are subdivided into a category of indicator lights, which have been recognized by a large number of customers. The indicator lights on the front panel and power supply device of the system are used to indicate the power status of the system. The power button controls the power supply to the input system power device. The power button indicator light can provide information about the power status.

A button switch for home lighting often has an indicator light on it. The resistance of this type of indicator light is extremely high, causing the current in the circuit to be extremely low, resulting in the voltage of the electrical appliance not reaching the rated voltage at night and not being able to light up. Generally, this type of indicator light has a capacitor inside because a small indicator light cannot accommodate a voltage of 220V.