Wattage: 18W, Type: T4 Fluorescent Tube, Color Temp (Kelvin): 4100K, Lumens: 1250, Length: 19.5 in., Diameter: 0.50 in., Base Type: G5 (miniature bi-pin), Average Life Hours: 10,000, Case Quantity: Order 10 for a full case, Color Emitted: Cool White. The length measurement includes the pins on both ends (measured pin-tip to pin-tip). All T4 fluorescent tubes have an overall length tolerance of +/- 1/8th in. - 0.125".