You are viewing a 60w T9 Circular triphosphor fluorescent tube with a 29mm tube diameter. Average lamp life is around 10,000 hours or 10 years with average use. This 60w T9 Is identical to all market leading 60w T9 tubes. If you\'re replacing tubes with references such L60w, FC60w or similar then this is like for like replacement. T9 Circular lamps are available in colours - Warm White = 830, Standard White = 835 and Cool White = 840. 60w T9 circular tubes have a G10q 4 pin cap. These circular tubes are boxed in 12\'s. General Characteristics Wattage [W] 60 Voltage [V] 230 Cap/Base G10q Bulb Shape Circular Bulb Diameter [mm] 409mm Colour Rendering Index (CRI) [Ra] 82 Rated Life L7 [h] 10000 Dimming Capability Yes