Domestic emergency lighting systems use self-contained power independent control type. The normal power supply is connected to the ordinary lighting power supply circuit. Usually, the emergency light battery is charged. When the normal power is cut off, the standby power supply (battery) is automatically powered. This type of emergency lamp has a large number of electronic components such as transformer, voltage regulator, charging, inverter, and battery inside each lamp. The battery needs to be charged and discharged when the emergency lamp is used, overhauled, and faulted. The other is a centralized power centralized control type. There is no independent power supply in the emergency lighting. When the normal lighting power supply fails, the centralized power supply system supplies power. In this type of emergency lighting system, the complex electronic circuits inside all the lamps are eliminated, and the emergency lighting lamps are the same as ordinary lamps. The centralized electricity supply system is set in a dedicated room.