OSRAM 849mm 39w T5 High Output Fluorescent Tube Colour 865 - 6500k - Daylight (Osram FQ39865) This Fluorescent tube has an excellent luminous flux, with it been up to 20% more economical than a T8 Tube and also uses all natural colours. 39w 30000 hours average lamp life T5 Slimline Shape Triphosphor CRI 107