Fluorescent lamps that come in non integrated and integrated designs. Integrated lamps operate on 240volt power supply and are a sealed unit. (Some other voltages are available for special purposes). Non integrated lamps plug into a light fitting with a fixed base and the lamps are replaceable The main manufactures that have a product range are Philips (PL), Osram (Dulux), Sylvania (Lynx) and GE (Biax)