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The Phoebus cartel was an international cartel that controlled the manufacture and sale of incandescent light bulbs in much of Europe and North America between 1925–1939. The cartel took over market territories and lowered the useful life of such bulbs.
In optics, violet is a spectral color (referring to the color of different single wavelengths of light), whereas purple is the color of various combinations of red and blue (or violet) light, some of which humans perceive as similar to violet.
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 lamps. Low-pressure sodium lamps only give monochromatic yellow light and so inhibit color vision at night.
Zazzle is an American online marketplace that allows designers and customers to create their own products with independent manufacturers (clothing, posters, etc.), as well as use images from participating companies.
22 of the very best first Father's Day gifts for new dads. 30+ of the best gifts for men, from $2 to over $100. Including a coffee candy that he'll want for a pick-me-up and the stylish backpack ...
A mercury-vapor lamp is a gas-discharge lamp that uses an electric arc through vaporized mercury to produce light. [1] The arc discharge is generally confined to a small fused quartz arc tube mounted within a larger soda lime or borosilicate glass bulb. [1]
Ellie Conley. Updated April 26, 2024 at 9:39 AM. The built-in night-light means you can save one of those plugs for something else. (Amazon) (Amazon) I wouldn't say I'm afraid of the dark, but...
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A fluorescent lamp, or fluorescent tube, is a low-pressure mercury-vapor gas-discharge lamp that uses fluorescence to produce visible light. An electric current in the gas excites mercury vapor, which produces short-wave ultraviolet light that then causes a phosphor coating on the inside of the lamp to glow.
According to AccuWeather the best days to see Manhattanhenge in 2024 will be at sunset on Wednesday 29 May, at around 8,12pm and Friday 12 July, at around 8.20pm. A “half-sun” is also ...