Pack of 5 Fluorescent Tubes T5 525mm 21 inches Cool White 4000k 13W : Amazon.co.uk
5 Foot T5 Fluorescent Tube 49W G5 4000K Cool White - John Cribb & Sons Ltd, UK Electrical Distributors, Dorset, Hampshire, Wiltshire, Somerset & the Isle of Wight.
6" 4W 5/8" White Fluorescent Lamps - Fluorescent Tubes