The 2G11 is a 4-pin cap that takes its suffix from the 11mm space that exists between the centres of all adjacent pins. The pins are positioned linearly. This cap is typically used in ‘Biax-L’ single-turn fluorescent lamps, which are characterised by a high lumen output. Though the term ‘Biax’ is used generically, this type of lamp is labelled differently according to manufacturer: Biax (GE), Lynx (Sylvania), Dulux (Osram), PL (Philips).
G9 Capsule (Halogen, LED, CFL).