Sylvania T5 fluorescent tubes are light sources making use of mercury. The biggest collections are the Luxline Standard and the Luxline Plus. T5 tubes have a G5 base, with tho pins that are 5 mm apart, and a diameter of 16 mm. When choosing a new Sylvania T5 tube, it is important to keep the same wattage, length (these are related), and light color. This way, you are assured to keep the same light effect after placing your new Sylvania T5 tube.