22 Watt 4000K Lumilux T9 Circular Fluorescent Lamp G10Q Base Cool White Osram 4008321581082 | eBay
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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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L 22W/840 C | Osram Circular Fluorescent Tube 22W 4000K 1350lm G10q 216mm | Distrelec International
Crompton Lamps Fluorescent T9 Circular 60W 4-Pin Cool White FC60W/840 | DIY at B&Q