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Blue Lights in the Basement, a studio album by American singer Roberta Flack released in 1977; Blue light phototherapy, light therapy involving a medical device that radiates blue light; Cobalt blue light, a type of light used by slit lamps to help in the diagnosis of eye diseases; Effects of blue light technology; Blue Lanterns (disambiguation)
Blue light is absorbed by the structural proteins, enzymes, and protein metabolites found in the lens. [9] The absorption of blue light creates yellow pigments in the lens's protein. The lens progressively darkens and turns yellow. [9] Blue light is absorbed by the lens, preventing blue light from reaching the retina at the back of the eye. [12]
Red and blue emergency lights on a fire engine in Canberra, Australia. Emergency vehicle lighting, also known as simply emergency lighting or emergency lights, is a type of vehicle lighting used to visually announce a vehicle's presence to other road users.
The use of flashing lights and sirens is colloquially known as blues and twos, which refers to the blue lights and the two-tone siren once commonplace (although most sirens now use a range of tones). In the UK, only blue lights are used to denote emergency vehicles (although other colours may be used as sidelights, stop indicators, etc.).
UK Slang term, originates from British police cars having blue lights. Blue Meanies 1960s and 1970s hippie slang for the police in Britain, referring to the blue uniforms and inspired by the bad guys in the 1968 Beatles film Yellow Submarine. Blå-blå Norwegian slang meaning "blue-blue", derivative of "popo" and in reference to blue lights and ...
A Morse code light is light in which appearances of light of two clearly different durations (dots and dashes) are grouped to represent a character or characters in the Morse Code. For example, "Mo(A)" is a light in which in each period light is shown for a short period (dot) followed by a long period (dash), the Morse Code for "A".
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A Blue Light Station is a combined emergency telephone and emergency power-off switch in rapid transit stations and other points along electrified railways. They are common in the United States and Canada. [citation needed] The location of such a device is usually indicated by a blue light.