Circular
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Circular fluorescent tubes, commonly known as circline lamps, are ring-shaped fluorescent lamps designed for flush-mount ceiling fixtures, decorative pendants, and commercial ring-light applications. Their compact circular form factor makes them a popular choice for kitchen ceilings, utility rooms, and enclosed fixtures where a wide, even light distribution is needed.
This category includes T9 circular tubes (the standard circline format) and T5 circular tubes (a slimmer, more energy-efficient option). Available in a range of diameters and wattages to fit common residential and commercial fixtures, these lamps use G10q and 2GX13 bases depending on the tube type.