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The first public demonstration of outdoor electrical lighting in the US was in Cleveland, Ohio, on April 29, 1879. [ 1 ] [ 8 ] Inventor Charles F. Brush had been perfecting the dynamo arc light , which could produce a glow equivalent to 4,000 candles in a single lamp. [ 8 ]
Low-pressure sodium lamps are highly efficient electrical light sources, but their yellow light restricts applications to outdoor lighting, such as street lamps, where they are widely used. [1] High-pressure sodium lamps emit a broader spectrum of light than the low-pressure lamps, but they still have poorer color rendering than other types of ...
Some street lights in New York City have an orange or red light on top of the luminaire (light fixture) or a red light attached to the lamppost. This indicates that near to this lighting pole or in the same intersection, there is a fire alarm pull box. [92]
Up the spook factor of your abode’s exterior with some orange and purple Halloween lights. Nearly 40 ft. of LED lights on black wire, these feature eight modes, including twinkle, for a lovely ...
The color of the light depends on the gas in the tube. Neon lights were named for neon, a noble gas which gives off a popular orange light, but other gases and chemicals called phosphors are used to produce other colors, such as hydrogen (purple-red), helium (yellow or pink), carbon dioxide (white), and mercury (blue). Neon tubes can be ...
The spectrum of light emitted from a fluorescent lamp is the combination of light directly emitted by the mercury vapor, and light emitted by the phosphorescent coating. The spectral lines from the mercury emission and the phosphorescence effect give a combined spectral distribution of light that is different from those produced by incandescent ...
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