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Sunlite FC8T9/DL 8-Inch T9 Round Fluorescent Circline Lamp, 22 Watts, 1050 Lumens, 6500K Daylight, G10Q 4-Pin Base, 1 Pack - Walmart.com
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Philips 32-Watt 12 in. Linear T9 Circline Fluorescent Tube Light Bulb Bright White (3000K) (1-Pack) 391227 - The Home Depot
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22W T5 Circular Fluorescent Bulb Replacement for Floxite T5 22W Circular Mirror Light Bulb by Technical Precision - 4-Pin Connector Base Circline Fluorescent Bulb - 6500K - 7.25 Inch Outside Diameter - Amazon.com
Project 'Green' House #1: LED replacement lighting for circular fluorescent tubes // DavidJB.com // Python, Technology, Web, Linux, and more, by David Beitey
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CHKADAWA FC12T9 32 Watts Circline Light Bulbs Daylight, Circular 12 Inch T9 32W Round Fluorescent Bulb Replacement for Circle Ceiling Fixture Lamp, DL 6500K Tube, G10q 4 Pin Base, 2 Pack - Amazon.com
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Sylvania 20148 - FC8T9/CW TUFFCOAT SYLVANIA BRAND Circular T9 Fluorescent Tube Light Bulb (8" diameter, 22 watts) - Circline Bulbs - Amazon.com
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