History and Modern Usage
Xenon short-arc lamps were invented in the 1940s in Germany and introduced in 1951 by Osram. First launched in the 2 kW size (XBO2001), these lamps saw wide use in movie projection, where they replaced the older, more complicated carbon arc lamps. The white, continuous light generated by the xenon arc is spectrally similar to daylight, but the lamp has a rather low efficiency in terms of lumens of visible light output per watt of input power. Today, almost all movie projectors in theaters employ these lamps, with power ratings ranging from 900 watts up to 12 kW. Omnimax (Imax Dome) projection systems use single xenon lamps with ratings as high as 15 kW.
Read more about this topic: Xenon Arc Lamp
Famous quotes containing the words history, modern and/or usage:
“To summarize the contentions of this paper then. Firstly, the phrase the meaning of a word is a spurious phrase. Secondly and consequently, a re-examination is needed of phrases like the two which I discuss, being a part of the meaning of and having the same meaning. On these matters, dogmatists require prodding: although history indeed suggests that it may sometimes be better to let sleeping dogmatists lie.”
—J.L. (John Langshaw)
“Grief that is dazed and speechless is out of fashion: the modern woman mourns her husband loudly and tells you the whole story of his death, which distresses her so much that she forgets not the slightest detail about it.”
—Jean De La Bruyère (16451696)
“Girls who put out are tramps. Girls who dont are ladies. This is, however, a rather archaic usage of the word. Should one of you boys happen upon a girl who doesnt put out, do not jump to the conclusion that you have found a lady. What you have probably found is a lesbian.”
—Fran Lebowitz (b. 1951)