5.5 Inches OD T4 12 Watt 6400K Circular Fluorescent Bulb FCL/T4/12W Circline Lamp Round Bulb for Magnifier and Desk Lamp Daylight 6500K

Bulbrite F12T4/64K 6400K 12-watt Linear Fluorescent T4 Bulb with Mini Bi-Pin Base, 17-Inch, Daylight

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FC12T4/865 12W T4 6400K Daylight Circular Fluorescent Lamp 8,140 Remaining In Stock This lamp is 4.75" outside diameter. If you need the 5.45" outside diameter lamp go here. $4.95 Each

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Bulbrite F12T4/64K 6400K 12-watt Linear Fluorescent T4 Bulb with Mini Bi-Pin Base, 17-Inch, Daylight

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Jesco Lighting SG4-12SW/64-W Sleek Plus Classic Grounded 12-Watt T4 Light Fixture, 6400K Color, White Finish, with Switch

Wattage: 12W, 12 Watt Watts Glass: T-4, T4, Circline, Circular Fluorescent Base: G10Q 4-Pin Initial Lumens: 980 Lumen Light Output Maximum Overall Diameter: MOD 5.45" Inside Diameter: 4.5" Average Rated Life: 10,000 hours Color Temperature: 6400°K, 6400K, Daylight CRI: 80-89, 1B Tri Phosphors