Knightsbridge 20W T4 Fluorescent Bulb The Knightsbridge T420TUBE 20 Watt T4 Fluorescent cool white 4000k tube, diameter of 13mm and measuring 568mm in length including pins and 554mm excluding pins, is ideal for low energy cabinet shelf lighting in the home and commercial use. Please double-check length of this tube before ordering as some manufacturers have different T5 tube lengths, despite having the same wattage. Slimline fluorescent tube is flicker-free and instant start, 240v mains power. Constructed in high-quality materials with good build quality. 2 Pin end cap connectors. EU Energy Efficiency Rating E and CE approved. Technical Specification: Colour Temperature: 4000K Colour Description: Cool White Dimensions: Length Including Pins: 568mm Length Excluding Pins: 554mm Diameter: 13mm You may also be interested in the T16 Fluorescent Tube.