During power cuts, Philips Inverter bulb will provide light up to 4 hours continuously, therefore being a perfect power backup for your home. 2-Fast-charging, with the automatic charging feature, Philips Inverter bulb will get automatically charged when it is kept ON, with the charging time of 8-10 hours. Philips Inverter bulb is the perfect lighting backup during power cuts and can be used in your study/drawing room and bathroom in your home, retail shops and hospital.