Light filters for lighting.Headlamps are increasingly plastics-intensive, which improves design but which, notes the people at Schott Lighting Components (www.schott.com; Mainz, Germany), can be prematurely aged by ultraviolet An invisible band of radiation at the upper end of the visible light spectrum. With wavelengths from 10 to 400 nm, ultraviolet starts at the end of visible light and ends at the beginning of X-rays. The primary source of ultraviolet light is the sun. (UV) and infrared (IR) radiation emitted by such things as xenon xenon (zē`nŏn) [Gr.,=strange], gaseous chemical element; symbol Xe; at. no. 54; at. wt. 131.29; m.p. −111.9°C;; b.p. −107.1°C;; density 5.86 grams per liter at STP; valence usually 0. and halogen lamps halogen lamp or tungsten-halogen lamp Incandescent lamp with a quartz bulb and a gas filling that includes a halogen. It gives brilliant light from a compact unit. . So they've devised UV and IR filter coatings that transmit the visible light spectrum but filter out the harmful wavelengths. [ILLUSTRATION OMITTED] |
|
||||||||||||||||||
Printer friendly
Cite/link
Email
Feedback
Reader Opinion