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A fluorescent lamp tube is filled with a mix of argon, xenon, neon, or krypton, and mercury vapor. The pressure inside the lamp is around 0.3% of atmospheric pressure. [27] The partial pressure of the mercury vapor alone is about 0.8 Pa (8 millionths of atmospheric pressure), in a T12 40-watt lamp. [28]
The energy-saving T12 lamps are made to operate on ballasts designed for 40-watt F40T12 lamps, though some F40T12 ballasts are not be designed to operate these lamps, and can overheat if energy-saving lamps are used. Running an energy-saving T8 tube with a ballast for T12 will reduce lamp life and can increase energy consumption. [9]
Circular and U-shaped lamps were devised to reduce the length of fluorescent light fixtures. The first fluorescent light bulb and fixture were displayed to the general public at the 1939 New York World's Fair. The spiral CFL was invented in 1976 by Edward E. Hammer, an engineer with General Electric, [7] in response to the 1973 oil crisis. [8]
He led the development of the Watt Miser (marketed as the F-40 Watt Miser), which was released in 1973. In 1976, he invented the first compact fluorescent lightbulb , but due to the difficulty of the manufacturing process for coating the interior of the spiral glass tube, GE did not manufacture or sell the device.
Fluorescent: 32 W T12 tube with magnetic ballast 60 [39] 9% 9–32 W compact fluorescent (with ballast) 46–75 [18] [40] [41] 8–11.45% [42] T8 tube with electronic ballast 80–100 [39] 12–15% PL-S 11 W U-tube, excluding ballast loss 82 [43] 12% T5 tube 70–104.2 [44] [45] 10–15.63% 70–150 W inductively-coupled electrodeless lighting ...
40 W incandescent lamp at 230 volts: 325 7 W high-output white LED: 450 6 W COB filament LED lamp: 600 18 W fluorescent lamp: 1250 100 W incandescent lamp: 1750 40 W fluorescent lamp: 2800 35 W xenon bulb: 2200–3200 100 W fluorescent lamp: 8000 127 W low pressure sodium vapor lamp: 25,000 400 W metal-halide lamp: 40,000 Values are given for ...
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