• Lampshade fixing 42mm diameter• For our 13W Energy Saving Bulb please click here• For our 18W Energy Saving Bulb please click here The design of the Lampholder accepts an industry standard 4 pin 10W, 13W & 18W G24 Q1 & Q2 lamp. This reduces the power consumption, when compared to an equivalent incandescent lamp, by up to 80%. The Lampholder is designed to European standards & has a diameter of 42mm, which is larger than the typical Lampholder which is 29mm.A Safety feature which protects the installation will disconnect the supply to the Lampholder:• During a lamp change, when no lamp is present, or in the case of lamp failure at the end of lamp life.• This Safety feature is reset by switching the supply to the fitting off for 10 to 15 seconds. The name behind one of the widest ranges of wiring accessories, circuit protection & control equipment, covering residential, commercial & industrial markets worldwide. Known for innovative new products & concepts, Crabtree's uncompromising approach to quality has long established this brand as a market leader, with everyone who takes pride in a job done professionally