On our website you can find different lamps. The E27 socket is the most common. The ''E'' means that the light source has a connector that can be screwed into the lamp. The ''27'' stands for the length of the thread: 27 mm. Many old incandescent lamps have been replaced by LED E27 lamps. The lighting effect is similar to traditional incandescent lamps, but LED E27 lamps are more energy efficient and have a longer life.