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０前言管径为３８ｍｍ的Ｔ１２ＴＬ荧光灯于１９３９年在欧洲推出，这是照明界很重要的发展阶段。荧光灯的光效比当时流行的白炽灯高２～３倍。后来对这种灯的进一步研制又持续了多年，使其在显色指数和光效方面有很大提高，光效由３０ｌｍ／Ｗ增至５０ｌｍ／Ｗ。显色指数...
0 Introduction T12TL fluorescent tubes with a diameter of 38mm were introduced in Europe in 1939. This is a very important stage of development for the lighting industry. Fluorescent light efficiency than the then popular incandescent high 2 to 3 times. Later on further development of this lamp has continued for many years, so that it has greatly improved color rendering index and light efficiency, light efficiency increased from 30lm / W to 50lm / W. Color rendering index ...