Check the listing for details. General 45009 12 Watt Circular Fluorescent Magnifying Lamp Light bulb 4.75". Condition: New. Listed at 14.50 USD. General 45009 Circular Fluorescent Light Bulb for Desktop Magnifier Magnifying LampsThis is a Caprock brand replacement bulb used in magnifying lamps and desk lamps by Office Depot, Staples, General, Chicago Electric, Harbor Freight, Normande, and others. The lamp is a T4 design, so the tube is 1/2 inch in diameter. The outside diameter of the lamp is 4.75 inches. The connector has four brass pins arranged in a square, facing outside the bulb. These lamps come in two sizes (4.75 inches and 5.45 inches), so make sure you are ordering the right lamp, before you buy. The 6400 degree color temperature simulates bright daylight illumination. FREE SHIPPING to any US address. International buyers please request shipping quote before you buy. Payment must be received within five days to avoid negative feedback.