LED路(lu)燈（Light Emitting Diode，發光二級管(guan)）即半導體照(zhao)明(ming)燈。它(ta)是一種基于半導體PN結形成(cheng)的用微弱(ruo)的電(dian)(dian)(dian)(dian)能(neng)(neng)(neng)(neng)就能(neng)(neng)(neng)(neng)發光的高(gao)效固(gu)(gu)態(tai)光源，在(zai)一定的正向偏置(zhi)電(dian)(dian)(dian)(dian)壓和(he)注(zhu)(zhu)入(ru)電(dian)(dian)(dian)(dian)流下，注(zhu)(zhu)入(ru)P區(qu)的空穴和(he)注(zhu)(zhu)入(ru)N區(qu)的電(dian)(dian)(dian)(dian)子在(zai)擴散至有(you)源區(qu)后經(jing)輻射復(fu)合而發出光子，將電(dian)(dian)(dian)(dian)能(neng)(neng)(neng)(neng)直(zhi)接轉化為(wei)光能(neng)(neng)(neng)(neng)。它(ta)是一種固(gu)(gu)態(tai)冷光源，具有(you)環保(bao)無污染、耗電(dian)(dian)(dian)(dian)少、光效高(gao)、壽命(ming)長等(deng)特點，因此，LED路(lu)燈將成(cheng)為(wei)道路(lu)照(zhao)明(ming)節能(neng)(neng)(neng)(neng)改(gai)造(zao)的最佳(jia)選擇(ze)。