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?T8 lamp is a kind of fluorescent lamp (or fluorescent lamp, light tube, fluorescent tube), with a diameter of 1 inch, about 25 mm, belonging to a kind of gas discharge lamp.

It uses electricity to activate mercury vapor in argon or neon gas, forming a plasma and emitting short-wave ultraviolet light, which causes phosphates to fluoresce in visible light. The general fluorescent tube is made of glass and is equipped with sockets at both ends to connect the power supply and fix the position of the fluorescent tube.

Unlike a light bulb, a fluorescent tube must have a ballast (also known as a "ballast") that, in combination with a flare starter, produces a momentary high pressure that ionizes the gas. Some new fluorescent lamps, using a different ionization method from traditional fluorescent lamps, do not need to use ballast and glow starter, which greatly saves energy and reduces the size, so that it can be used in the lamp socket of traditional bulbs, also known as "energy-saving lamps" or "CFLS".