The features of an inverter LED bulb include fully automatic control, low power consumption, and high efficiency. It can be switched off when not required. When AC mains power goes off, this inverter bulb automatically switches on to act as a DC emergency light. This mode is used to charge the internal battery with the LED bulb off. However, most inverter LED bulbs come with a charge-only mode. The bulb is designed to charge the internal battery even during normal operation. Thereafter the charging voltage is automatically cut to protect the battery from getting overcharged.
These internal batteries require three to four hours of charging time to fully charge. Most inverter LED bulbs have lithium-ion batteries that provide three- to four-hour backup.
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