荧光灯和日光灯有什么区别

2025-03-28 10:00:51
推荐回答(1个)
回答1:

日光灯成为最早进入室内的LED灯具之一,因为它相对于荧光灯来说具有很多优点。 一、优点 相对于荧光灯来说,LED日光灯具有10大优点: 1.发光效率高: 荧光灯的发光效率大约是55-80lm/W(Philips公司T8荧光灯的发光效率为72lm/W),而LED的发光效率在100lm/W以上,最近Cree公司的XLampXP-G的发光效率已经到130流明/W,而且以后还会不断提升。二者之差现在已经将近一倍,而以后有可能达到3倍以上。 2灯具效率高: 灯具的效率主要是指有效光效,因为荧光灯是360度发光的,而在反方向发出的光就没有什么用处。所以荧光灯通常采用一个白色的灯罩,可以把相当一部分的反向光反射回来,一般来说,荧光灯的灯具效率大约只有70%.而LED日光灯则是120度发光的,所以全部光都是有效光。虽然有时候也会觉得120度发光角度窄了一点,不过大多数情况下还是够用的。而且这个发光角度也是可以根据需要来加以调整的。 3.LED光效高 前面提到Philips的T8荧光灯的发光效率为72lm/W,36W的荧光灯一共发出2592流明,但是灯具效率只有70%,所以有效的流明数为1814.4流明,而LED的发光效率已经超过130lm/W,假定为100lm/W,那么只要18W就可以达到1800流明,也就是只要荧光灯一半的功率就可以有相同的亮度。而且LED的发光效率还在逐年升高。 4.电源效率高 因为所有灯具除白炽灯以外都是需要有专门的电源供电的,电源的效率也就影响了整个灯具的效率。 下面以Philips公司的36WT8荧光灯为例。它的额定输出功率为36W,但是由于接入了电感镇流器,实测输入功率为42.4W,也就是铁芯电感损耗了6.4W,效率降低为85%,大多数国产的铁芯电感功耗在10W以上,功率因素低于0.512. 而LED的电源效率通常高达90%,一个18W的LED日光灯只要20W的输入功率。功率因素也可以达到0.9以上。 和荧光灯相比大约可以节省一半以上的电,也就是说采用一个18瓦的LED日光灯可以取代一个36瓦的荧光灯。 不仅如此,LED日光灯还有很多其他优点: 5.寿命长: 一个仔细设计的LED日光灯的寿命可以达到5万小时。而一个荧光灯的寿命通常只有5,000小时(有些国产的荧光灯寿命只有300小时)。二者相差将近10倍。最好的长寿命日光灯也只有10,000小时,二者也还相差5倍。 6. 不含汞,无污染。 我们知道,荧光灯都含有汞。36mm荧光灯中含有25-45mg的汞,26mm(T8)中含有20mg的汞。而荧光灯都是采用易碎的玻璃作为外壳,一旦玻璃破碎,其中的汞就会马上就会蒸发到空气中,瞬间可使周围空气中的汞浓度达到10-20毫克/立方米,超过国家规定的1000-2000倍。而汞是一种对人体十分有害的有毒物质,汞蒸气达0.04至3毫克时会使人在2至3月内慢性中毒,达1.2至8.5毫克时会诱发急性汞中毒,如若其量达到20毫克,会直接导致动物死亡。而1mg的汞就足以污染5454.5公斤的饮用水,使之达不到饮用标准。而LED日光灯中不含任何有毒物质,是一种完全绿色环保无污染光源。

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