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These wider lamps, like the PH 4/3 and PH 6/3, had a top shade from a larger model and a middle and bottom shade set from a smaller model. For example, a PH 4/3 lamp has a 40 cm top shade but a middle shade (20 cm) and a bottom shade (11.2 cm) created using the 3:2:1 proportions of a 30 cm top shade.
1994 T5 lamps with cool tip are introduced to become the leading fluorescent lamps with up to 117 lm/W with good color rendering. These and almost all new fluorescent lamps are to be operated on electronic ballasts only. [5] 1994 The first commercial sulfur lamp is sold by Fusion Lighting.
Aerolux Light Corporation was a manufacturer of artful gas-discharge light bulbs from the 1930s through the 1970s. [1] Aerolux made these bulbs in a factory in New York City . US Patents dating back to the 1930s describe the design and construction of these bulbs.
General Electric Building, New York (1940): 1931 building with Gothic crown creating a night-time effect of lack of solidity, relighted in 1940 to showcase fluorescent lighting, with red lights inside and blue outside the crown and a dimmer on a timer added for the existing white lights to produce color changes; spotlighting of architectural ...
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In 1980, the annual operating cost for the average incandescent lamp was $280; for mercury vapor lamps, it was $128; and for low-pressure sodium vapor lamps, it was $60 a year. [1] Meanwhile, high-pressure sodium vapor lamps cost only $44 a year to operate, with a standard life expectancy of 15,000 hours, which also helped to lower labor and ...
A Tiffany lamp is a type of lamp made of glass and shade designed by Louis Comfort Tiffany or artisans, mostly women, and made (in originals) in his design studio. The glass in the lampshades is put together with the copper-foil technique instead of leaded, the classic technique for stained-glass windows.
Flat-wick lamps have the lowest light output, center-draft round-wick lamps have 3–4 times the output of flat-wick lamps, and pressurized lamps have higher output yet; the range is from 8 to 100 lumens. A kerosene lamp producing 37 lumens for 4 hours per day for a month (120 hours) consumes about 3 litres (6.3 US pt; 5.3 imp pt) of kerosene.
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