这个说法是对的,LED灯的光源是冷光源,只能说LED发出来的光是不发热的(白炙灯的光是热的),LED灯的半导体是发热的,而且光效越低发热越大。而温度上升到LED的限制温度,其工作 * K& f0 ^+ |# e, r( w 电流就会急剧上升,光效也就急剧下降。这就是所谓的光衰。光衰是LED半导体不可逆转的物理现象。散热不好的灯头,LED发出的热不能迅速的传出并散发调,其光衰势必厉害 ! G" S8 p% \3 r5 e; _: C : d* ?: A, ]4 ~7 h 其等效亮度光源:60W普通白炙灯相当于25W普通节能灯/ 70W普通白炙灯相当于30W普通节能灯 / m' Y6 ?( i" B. C7 | % V; r1 n- v7 r: @( }
个人观点~!作者: kamleung 时间: 2010-8-31 17:06
40W 白炙灯 should get the higher temperature than 40W 节能灯. This is because the 白炙灯 uses heat to produce light and therefore its efficiency is so low. On average, it produces 17.5 lumens per watt of power. Lots of power is dissipated as heat rather than light. 3 u; Z) K# X( X$ g9 _) S2 I2 x5 m
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On the other hand, 节能灯 gets the better efficiency and it normally produces 60 to 72 lumens per input watt. That means much less power will be converted into heat. The temperature is therefore much lower than 白炙灯 although the rated powers of these two lamps are the same.作者: af204 时间: 2010-9-1 17:24
[s:87] [s:87] 居然问这么个问题。。。。。/ f; K& p/ |$ j
说明从来不注意观察身边的东西 / a1 b0 X+ Z3 F5 M* _- G4 m4 t" n/ g2 { Q& o" o# E
有些东西不是一定要试验的,多观察就知道了,这在安规这块来说,应该是常识作者: kobe_mai 时间: 2010-9-2 16:03
学习了。作者: gree76 时间: 2010-9-2 16:18
实际做一下就知道了。