"Electric lamp" redirects here. For the item of furniture, see
light fixture.
Various compact fluorescent (CFL) lightbulbs.
A clear glass 60W Neolux light bulb.
A lamp is a replaceable component such as an incandescent light bulb, which is designed to produce light from electricity. These components usually have a base of ceramic, metal, glass or plastic, which makes an electrical connection in the socket of a light fixture. This connection may be made with a screw-thread base, two metal pins, two metal caps or a bayonet cap. Re-lamping is the replacement of only the removable lamp in a light fixture.
Lamp circuit symbols[edit]
In circuit diagrams lamps usually are shown as symbols. There are two main types of symbols, these are:
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The cross in a circle, which usually represents a lamp as an indicator.
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The semicircular dent in a circle, which usually represents a lamp as a source of light or illumination.
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