40w T9 G10q Circular triphosphor fluorescent tubes with 29mm tube diameter, This T9 has an average life of 10,000 hours. This 40w T9 Is identical to all market leading 40w T9 tubes. If you\'re replacing tubes with references such as L40w, FC40w or similar then this is like for like replacement. T9 Circular lamps are available in colours - Warm White = 840 and Cool White = 830. 40w T9 circular tubes have a G10q 4 pin cap. These circular tubes are boxed in 12\'s. General Characteristics Wattage [W] 40 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