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T5 Lamps

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T5 fluorescent lamps are slimmer, smaller-diameter fluorescent sources used in applications where compact fixture profiles are needed. The T5 designation refers to a tubular lamp with a 5/8-inch diameter, and standard T5 lamps are available in 2-foot and 4-foot lengths in 14W and 28W configurations, respectively. T5 lamps are used in under-cabinet task lighting, display case lighting, slimline troffers, and a range of specialty commercial fixtures where the standard 1-inch T8 diameter is too large to fit within the fixture housing.

T5 lamps use a miniature bi-pin G5 base and require a T5-specific fluorescent ballast. They are not interchangeable with T8 lamps, which use a G13 base and different ballast requirements. The smaller diameter allows fixture manufacturers to design more compact, architecturally refined housings, making T5 lamps popular in retail display and architectural applications where fixture aesthetics matter. RelightDepot carries T5 lamps in 3000K, 3500K, 4100K, and 5000K color temperatures from commercial-grade manufacturers.

Pair T5 lamps with the correct ballasts and explore LED upgrade paths. See our T5 and T5HO ballasts for compatible drivers. The higher-output version is in our T5HO lamps section for high-bay and industrial applications. Browse T8 lamps for standard troffer applications, and view the full fluorescent lamps selection.