This 18\" 15W T8 tube triphosphor fluorescent light bulb provides a superior quality of light, with greater energy efficiency and a longer life. Fitted with a standard sized G13 2-pin (13mm apart) caps to both ends.Unlike a standard tube, triphosphor tubes retain their high quality of output throughout their life time. With uniformly good colour rendering illuminating objects in their natural light, these tubes are ideal for shop lighting, as well as for high-quality lighting in the office and home.For maximum performance and efficiency from your new fluorescent tube, we recommend you replace the fluorescent starter at the same time.Need more help in choosing a suitable fluorescent tube? Read our guide Choosing Flourescent Tubes and our guide to Flourescent Starters.