LED路(lu)燈（Light Emitting Diode，發光(guang)(guang)二級管）即半(ban)導體(ti)照(zhao)明(ming)(ming)燈。它(ta)是一種基于半(ban)導體(ti)PN結形成的(de)(de)(de)(de)用微弱的(de)(de)(de)(de)電(dian)(dian)能(neng)就(jiu)能(neng)發光(guang)(guang)的(de)(de)(de)(de)高(gao)效固(gu)態(tai)光(guang)(guang)源，在一定的(de)(de)(de)(de)正(zheng)向偏(pian)置電(dian)(dian)壓和注(zhu)入電(dian)(dian)流下，注(zhu)入P區(qu)的(de)(de)(de)(de)空穴和注(zhu)入N區(qu)的(de)(de)(de)(de)電(dian)(dian)子在擴(kuo)散(san)至有(you)(you)源區(qu)后經輻射復合而發出光(guang)(guang)子，將(jiang)電(dian)(dian)能(neng)直(zhi)接轉化(hua)為光(guang)(guang)能(neng)。它(ta)是一種固(gu)態(tai)冷光(guang)(guang)源，具有(you)(you)環保無(wu)污(wu)染(ran)、耗電(dian)(dian)少、光(guang)(guang)效高(gao)、壽命長等特點，因此，LED路(lu)燈將(jiang)成為道路(lu)照(zhao)明(ming)(ming)節能(neng)改造(zao)的(de)(de)(de)(de)最佳選擇。