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A lightbulb socket, lightbulb holder, light socket, lamp socket or lamp holder is a device which mechanically supports and provides electrical connections for a compatible electric lamp base. [1] Sockets allow lamps to be safely and conveniently replaced (re-lamping).
A metal halide lamp with a bipin cap. A bipin or bi-pin (sometimes referred to as two-pin, bipin cap or bipin socket) is a type of lamp fitting.They are included in the IEC standard "IEC 60061 Lamp caps and holders together with gauges for the control of interchangeability and safety".
The bulbs have right-hand threaded metal bases (caps) which screw into matching threaded sockets (lamp holders). For bulbs powered by AC current, the thread is generally connected to neutral and the contact on the bottom tip of the base is connected to the "live" phase.
A metal-halide lamp is an electrical lamp that produces light by an electric arc through a gaseous mixture of vaporized mercury and metal halides [1] [2] (compounds of metals with bromine or iodine). It is a type of high-intensity discharge (HID) gas discharge lamp . [ 1 ]
Lamp bases may be secured to the bulb with a cement, or by mechanical crimping to indentations molded into the glass bulb. Lamps intended for use in optical systems have bases with alignment features so that the filament is positioned accurately within the optical system. A screw-base lamp may have a random orientation of the filament when the ...
Mogul-base lamps are available for industrial use in larger power ratings (250–1500) and in halogen, mercury vapor, high-pressure sodium and metal-halide lamp configurations. Compact fluorescent mogul-base bulbs are also available, as are adaptors to allow medium-base bulbs to be used in mogul sockets.