![]() ![]() The striking voltage is reduced by ambient light or radioactivity. The lamp glow discharge lights at its striking voltage. The gas is typically a Penning mixture, 99.5% neon and 0.5% argon, which has lower striking voltage than pure neon, at a pressure of 1–20 torrs (0.13–2.67 kPa). ![]() I-K region: arc discharge large amounts of radiation produced.Ī small electric current (for a 5 mm bulb diameter NE-2 lamp, the quiescent current is about 400 ♚), which may be AC or DC, is allowed through the tube, causing it to glow orange-red. Voltage-current characteristics of electrical discharge in neon at 1 torr, with two planar electrodes separated by 50 cm.Ĭ: Avalanche breakdown Townsend dischargeĪ-D region: dark discharge ionisation occurs, current below 10 microamps.į-H region: glow discharge the plasma emits a faint glow. ![]() Glow lamps found practical use as indicators in instrument panels and in many home appliances until the widespread commercialization of light-emitting diodes (LEDs) in the 1970s. Since the electrodes could take almost any shape imaginable, a popular application has been fanciful decorative lamps. The electrodes would glow brightly in red or blue, depending on the gas, and the lamps lasted for years. Moore mounted two electrodes close together in a bulb and added neon or argon gas. A Smithsonian Institution website notes, "These small, low power devices use a physical principle called coronal discharge. The difference in design was sufficient that a U.S. The lamp has a very different design from the much larger neon tubes used for neon lighting. Īround 1917, Daniel Moore developed the neon lamp while working at the General Electric Company. by his company, Claude Neon Lights, through the early 1930s. patent was issued to Claude covering the design of the electrodes for neon tube lights this patent became the basis for the monopoly held in the U.S. After 1902, Georges Claude's company, Air Liquide, was producing industrial quantities of neon as a byproduct of his air liquefaction business, and in December 1910 Claude demonstrated modern neon lighting based on a sealed tube of neon. Moore tubes were commercialized by their inventor, Daniel McFarlan Moore, in the early 1900s. Neon's scarcity precluded its prompt application for electrical lighting along the lines of Moore tubes, which used electric discharges in nitrogen. The characteristic, brilliant red color that is emitted by gaseous neon when excited electrically was noted immediately Travers later wrote, "the blaze of crimson light from the tube told its own story and was a sight to dwell upon and never forget." Neon was discovered in 1898 by William Ramsay and Morris W. A General Electric NE-34 glow lamp, manufactured circa 1930 ![]()
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