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These sockets included switches, but required bulbs to be mounted upright. The Edison organization developed a screw-base in 1880 which was initially made of wood but later made of plaster of Paris. [3] Many competitive designs of lamps and sockets appeared in the early era of incandescent lighting, which often were incompatible with other designs.
Portable light fixtures are often called lamps, as in table lamp or desk lamp. In technical terminology, the lamp is the light source, which, in casual terminology, is called the light bulb. Both the International Electrotechnical Commission (IEC) and the Illuminating Engineering Society (IES) recommend the term luminaire for technical use. [4]
Portable lamps such as table lamps may have a light switch mounted on the socket, base, or in-line with the cord. Manually operated on/off switches may be substituted by dimmer switches that allow controlling the brightness of lamps as well as turning them on or off, time-controlled switches, occupancy-sensing switches, and remotely controlled ...
Two modern electric lamps with lampshades. A lampshade is a fixture that envelops the light bulb on a lamp to redirect the light it emits. The shade is often affixed onto a light fixture to reduce the intensity of the light to observers, shield the light from a harsh environment, or for decoration by altering the color or creating shadows.
Circuit diagram of a 3-way switch and socket. The switch used to control a 3-way lamp is usually a rotary switch or a pull-chain switch. Although it is referred to as a 3-way switch, it has four positions, off, lamp one (low), lamp two (medium), and lamps one and two (high).
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