9691 x 6556 px | 82,1 x 55,5 cm | 32,3 x 21,9 inches | 300dpi
Ubicazione:
London, United Kingdom
Altre informazioni:
The common fluorescent tube relies on fluorescence. Inside the glass tube is a partial vacuum and a small amount of mercury. An electric discharge in the tube causes the mercury atoms to emit light. The emitted light is in the ultraviolet (UV) range and is invisible, and also harmful to living organisms, so the tube is lined with a coating of a fluorescent material, called the phosphor, which absorbs the ultraviolet and re-emits visible light. Fluorescent lighting is very energy efficient compared to incandescent technology, but the spectra produced may cause certain colors to appear unnatural. Some claim they may lead to adverse health effects, though that has not been verified. And as with all light sources, over-illumination is possible. In the mid 1990s, white light-emitting diodes (LEDs) became available, which work through a similar process. Typically, the actual light-emitting semiconductor produces light in the blue part of the spectrum, which strikes a phosphor compound deposited on the chip; the phosphor fluoresces from the green to red part of the spectrum. The combination of the blue light that goes through the phosphor and the light emitted by the phosphor produce a net effect of apparently white light. Within industry, piping is a system of pipes used to convey fluids, from one location to another. The engineering discipline of piping design studies the best and most efficient manner of transporting fluid to where it is most needed.[1][2]
