standard E27,easy to install and replace for normal bulbs.Super high efficency,energy saving,long use life. ·90~240VAC input, standard E27 socket. ·The total power is 3W, luminance is 300LM. ·Super high efficency, energy saving. ·Perfect replace for normal energy saving and incandescent bulbs. ·Long working life, up to 50,000 hours.