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T5 retrofit conversion is a means of converting light fittings designed to use T8 format lamps, so that they can use more energy-efficient T5 lamps. [1] This is done by electronically converting the luminaires to high frequency operation.
The term retro-fit is also used to refer to these tubes, as the new LED tube will fit into the old fixture without modification. In these cases, the LED tubes may also be compliant with the EN 62776 standard. LED tubes compatible with the narrow T5 fluorescent tubes are also being introduced to the markets. They mainly comply with types 3 and 4 ...
Typical diameters are T12 or T38 (1 + 1 ⁄ 2 in or 38 mm) for larger, often less efficient lamps, T8 or T26 (1 in or 25 mm) for smaller and often energy-saving lamps, and T5 or T16 (5 ⁄ 8 in or 16 mm) for very small lamps, which may even operate from a battery-powered device.
Fixture manufacturing began soon after production of the incandescent light bulb. [citation needed] When practical uses of fluorescent lighting were realized after 1924, the three leading companies to produce various fixtures were Lightolier, Artcraft Fluorescent Lighting Corporation, and Globe Lighting in the United States. [5]
The gas used in the fluorescent tube must be ionized before the arc can "strike" . For small lamps, it does not take much voltage to strike the arc and starting the lamp presents no problem, but larger tubes require a substantial voltage (in the range of a thousand volts). Many different starting circuits have been used.
A light fixture or luminaire is a technical and professional term for the electrical fixtures used to hold a lamp—a light bulb—the light source. Wikimedia Commons has media related to Lighting fixtures .