Easily mount the adapter in an E27 fitting and use G9 bulbs without any problems. Thanks to the high-quality workmanship, the adapter has an optimal fit. This adapter is compatible with all common light sources such as LED, halogen or energy saving bulbs. Electrical data Rated voltage in V: 250 Operating temperature in °C max. 200° Dimensions and weight Diameter in mm: 26 Length in mm: 44 Net weight in g: 33