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The incandescent light bulb, incandescent lamp or incandescent light globe makes light by heating a metal filament wire to a high temperature until it glows. The hot filament is protected from air by a glass bulb that is filled with inert gas or evacuated. In a halogen lamp, a chemical process returns metal to the filament, extending its life. The light bulb is supplied with electrical current by feed-through terminals or wires embedded in the glass. Most bulbs are used in a socket which supports the bulb mechanically and connects the current supply to the bulb's electrical terminals.
Cold-cathode lamps include cold-cathode fluorescent lamps (CCFLs) and neon lamps.CCFLs use a discharge in mercury vapor to develop ultraviolet light, which in turn causes a fluorescent coating on the inside of the lamp to emit visible light.
Cold-cathode lamps are used for backlighting of LCD displays, for example computer monitors and television screens.
In the lighting industry, “cold cathode” historically refers to luminous tubing which is larger than 20mm in diameter and operates on a current of 120 to 240 milliamps. This larger diameter tubing is often used for interior alcove and general lighting.[2][3] The term "neon lamp" refers to tubing that is smaller than 15 mm diameter and typically operates at approximately 40 milliamps. These lamps are commonly used for neon signs.
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