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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]
Two newer ranges, high-efficiency (HE) 14–35 W, and high-output (HO) 24–80 W, introduced in the 1990s. [2] Panasonic's range of FHL fluorescent tubes in 18W, 27W, and 36W varieties for the Japanese market. Circular fluorescent tubes. Thorn/General Electric 2D fluorescent lamps and other similar lamps from various manufacturers. T6 3 ⁄ 4: ...
Light fixtures which have earned Energy Star combine quality design with the high energy efficiency. [32] To qualify for an Energy Star rating light fixtures must: [33] Uses 1/4 the energy of traditional lighting; Reduced energy bills and bulb replacement. Lifetime is at least 10,000 hours; Even light distribution
Fluorescent light fixtures cannot be connected to dimmer switches intended for incandescent lamps. Two effects are responsible for this: the waveform of the voltage emitted by a standard phase-control dimmer interacts badly with many ballasts, and it becomes difficult to sustain an arc in the fluorescent tube at low power levels.
60 W incandescent light bulb with energy efficiency class E Equivalent 42 W halogen incandescent light bulb with efficiency class C Compact fluorescent lamp LED lamp circa 2021. Various governments have passed legislation to phase out manufacturing or importation of incandescent light bulbs for general lighting in favor of more energy-efficient ...
Luminous efficacy can be normalized by the maximum possible luminous efficacy to a dimensionless quantity called luminous efficiency.The distinction between efficacy and efficiency is not always carefully maintained in published sources, so it is not uncommon to see "efficiencies" expressed in lumens per watt, or "efficacies" expressed as a percentage.
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