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This ring-shaped fluorescent lamp is an energy saving, slim and compact light source that was designed for shallow and slender recessed, ceiling and wall mounted light fixtures; these fixtures are frequently found in retail, residential, office, hotel and commercial applications. Circular fluorescent lamps will only fit into existing Circular fluorescent tube fixtures. The Circular Fluorescent Tube is a uniquely shaped light source that comes in T5 (15mm diameter), T6 (20mm diameter) and T9 (29mm diameter) formats. It is important to check the diameter when ordering your replacement circular fluorescent tube.