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Like the European modular furniture, display cabinets, ceiling tile grids, etc. they were designed for, these are based on multiples of the 300 mm (11.8 in) "metric foot" instead of the 12 in (305 mm) imperial foot, but are all 37 mm (1.5 in) shorter to allow space for the lampholder connections within the 300 mm modular units, and for much ...
The suffix after the G indicates the pin spread; the G dates to the use of Glass for the original bulbs. GU usually also indicates that the lamp provides a mechanism for physical support by the luminaire: in some cases, each pin has a short section of larger diameter at the end (sometimes described as a "peg" rather than a "pin" [2]); the socket allows the bulb to lock into place by twisting ...
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 T5 – 5/8 or 0.625 in (15.875 mm) in diameter
Fluorescent lamp efficacy is dependent on lamp temperature at the coldest part of the lamp. In T8 lamps this is in the center of the tube. In T5 lamps this is at the end of the tube with the text stamped on it. The ideal temperature for a T8 lamp is 25 °C (77 °F) while the T5 lamp is ideally at 35 °C (95 °F).
Unlike bayonet sockets, three-way and regular lamps are interchangeable, although the low filament or low setting does not work if mismatched. The small Edison screw has nine threads per inch, or a pitch of 1 ⁄ 9 in or 2.8222 mm per thread. The medium Edison screw has seven threads per inch, or a pitch of 1 ⁄ 7 in or 3.
W2.1x9.5d base, a common 5-watt bulb in landscape lighting and some interior automotive applications such as the dome light. A wedge base is a type of electrical connector used as a fitting for small light bulbs.