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2. Light switch - Wikipedia

   en.wikipedia.org/wiki/Light_switch

   Two light switches in one box. The switch on the right is a dimmer switch. The switch box is covered by a decorative plate. The first light switch employing "quick-break technology" was invented by John Henry Holmes in 1884 in the Shieldfield district of Newcastle upon Tyne. [1]

3. Multiway switching - Wikipedia

   en.wikipedia.org/wiki/Multiway_switching

   If only one light is being switched and no unswitched connection is needed, this system uses more long wires than the standard system (four instead of three), but if the switched light is close to the switch near the fuse box and a receptacle needs to be powered near the far switch it will use fewer long wires (four instead of five).

4. Wireless light switch - Wikipedia

   en.wikipedia.org/wiki/Wireless_light_switch

   Wireless light switches eliminate the wire from the light to the switch location. This is useful in remodelling situations where new wiring can be a hassle. Rather than tearing down a wall to gain access to the wires, a wireless switch can be used. This avoids any need to access wires and makes remodelling fast and simple.

5. Dimmer - Wikipedia

   en.wikipedia.org/wiki/Dimmer

   This small device allowed the dimmer to be installed in a standard electrical wall box while saving energy. [2] [3] In 1966, Eugene Alessio patented a light bulb socket adapter for adjusting a light level on a single light bulb using a triac. To house this device, he decided on a 2-inch round device with one end capable of being screwed into a ...

6. Light fixture - Wikipedia

   en.wikipedia.org/wiki/Light_fixture

   There are various types of devices used to manage the amount of light used: [6] 3-way 2-circuit switch; Dimmer (this allows the user to make a light brighter or dimmer, typically using a rotary dial) Light switch (often part of the light socket or power cord on portable fixtures) Lighting control system; Motion detector; Timer; Touch; X10 systems

7. 3-way lamp - Wikipedia

   en.wikipedia.org/wiki/3-way_lamp

   A 3-way lamp, also known as a tri-light, is a lamp that uses a 3-way light bulb to produce three levels of light in a low-medium-high configuration. A 3-way lamp requires a 3-way bulb and socket, and a 3-way switch. In 3-way incandescent light bulbs, each of the filaments operates at full voltage. Lamp bulbs with dual carbon filaments were ...