Wattage: 38W, Type: 2D Fluorescent Lamp, Color Temp (Kelvin): 3500K, Lumens: 2850, Height: 1.25 in., Diameter: 8.10 in., Base Type: GR10q-4 (4-pin base), Average Life Hours: 12,000, Case Quantity: Order 20 for a full case, Color Emitted: Soft White - Please ensure your fixture's ballast or starting mechanism is fully functioning as these components often need replacing. If your ballast or starting mechanism needs replacing; a new bulb will not function as all components are required to be in working order. - Norman Lamps, Inc.