4W E27 LED Bulb, Warm White 3000K, Standard Size, Equivalent 40W Brightness of 4W LED light: 40W halogen incandescent light LED lamp generate much less heat than Direct replace customer's old halogen lamp in customer's existing light system as it work on 12V AC and 12V DC (most traditional halogen incandescent lamp use 12V AC) City beautification, portable lighting, illumination and decoration at home and public area Entertainment and architectural lighting