荧光灯(Fluorescent lamp),通常是装有汞蒸汽的一支真空管,管的两端各封有灯丝一圈,灯丝上涂有氧化物,能于电流通过时发射大量的电子。这种电子把管内汞蒸汽的分子撞击而游离,发出人目不能见的紫外线来,紫外线再射击管内所涂的发光质上,于是就发出可见的光了。荧光灯的发光,是利用气体放电,和普通电灯利用灯丝白炽而发光的情形不同,因此荧光灯比普通电灯的效率高,寿命长,用电省,而且发光柔和,毫不耀眼。所以从1938年问世以来,仅短短十几年中,已成为家喻户晓,照明用的最主要光源了。荧光灯所发之光,通常所见的多为柔和的白光,和日光相仿,故俗亦称日光灯。实际上,荧光灯所发白光的光谱与日光的光谱相同,所差的只是 Fluorescent lamps, usually a vacuum tube containing mercury vapor, each end of which is sealed with a filament that is coated with an oxide that emits a large amount of electrons as the current passes. The electron hits the mercury vapor molecules inside the tube and releases it, sending out ultraviolet light, which can not be seen by human’s eyes. The ultraviolet light re-shoots the luminous substance in the tube and emits visible light. Fluorescent light is the use of gas discharge, and the use of conventional filament incandescent and filament incandescent and the situation is different, so the fluorescent lamp than ordinary high efficiency, long life, power-saving province, and shine soft, no dazzling. Therefore, since its publication in 1938, it has become the most important light source for household use and lighting in just a dozen or so years. Fluorescent light of the light, usually seen mostly as soft white, and similar to sunlight, so vulgar, also known as fluorescent. In fact, the fluorescent white light emitted by the spectrum with the same spectrum of sunlight, the difference is only