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Fluorescent tube diameter designation comparison Designation Tube diameter Extra (in) (mm) Socket Notes T2 1 ⁄ 4 approx. 7 WP4.5×8.5d Osram's Fluorescent Miniature (FM) tubes; Sylvania Luxline Slim T2 Linear; T4 1 ⁄ 2: 12.7 G5 bi-pin: Slim lamps. Power ratings and lengths not standardized (and not the same) between different manufacturers ...
5 mm: T4 and T5 fluorescent tubes: G5.3: 7004-73-2: 5.33 mm: 1.47–1.65 mm ... These are used with compact fluorescent tubes that plug into a light fixture that has ...
A fluorescent lamp, or fluorescent tube, is a low-pressure mercury-vapor gas-discharge lamp that uses fluorescence to produce visible light. An electric current in the gas excites mercury vapor, to produce ultraviolet and make a phosphor coating in the lamp glow.
Fluorescent Linear Tube Light bulbs are measured in 1 ⁄ 8 of inches. So a T12 fluorescent is 12 ⁄ 8 of an inch in diameter or 12 ⁄ 8 = 1.50" T4 – 4/8 or 0.500 in (12.7 mm) in diameter
Circular and U-shaped lamps were devised to reduce the length of fluorescent light fixtures. The first fluorescent light bulb and fixture were displayed to the general public at the 1939 New York World's Fair. The spiral CFL was invented in 1976 by Edward E. Hammer, an engineer with General Electric, [7] in response to the 1973 oil crisis. [8]
The design was initiated by the U.S. EPA and the Lighting Research Center in 2004, in order to facilitate the deployment of compact fluorescent light bulbs with replaceable ballasts. [ 1 ] The GU24 fitting is compliant with a 2008 ruling by the California Energy Commission under Title 24 ( California Building Standards Code ) to require high ...