GD Lights LED products provide the right light for all your needs. GD Rechargeable Emergency Inverter LED Bulbs. Emergency Lighting bulb when there is a power cut. Lithium battery with full capacity 3 to 4-hour backup. After 3 to 4 hours battery will still work with a dim light up to 10 hours. Charging time is 3-4 hours. Once Battery is fully charged it auto cuts the power and protects the battery from getting overcharged. Automatically turns on AC to DC while power cuts. When power is off the Identification Circuit of this inverter bulb automatically switches on DC emergency light. It can be switched off is not needed. Full electronic control, Low power consumption & high efficiency. It works as a normal Light Bulb when power is on, and as an Inverter Bulb when power is off from the grid. Emergency Lighting bulb when power is off. Excessive brightness can cause discomfort to your eyes. But the right light provides more comfort physical ease and relaxation when looking directly at them.