Umthombo wokukhanya wamalambu esignali yomgwaqo manje uhlukaniswe ikakhulukazi izigaba ezimbili, esisodwa siwumthombo wokukhanya we-LED, esinye siwumthombo wokukhanya wendabuko, okungukuthi isibani se-incandescent, isibani se-low-voltage halogen tungsten, njll., kanye nezinzuzo ngokuya ngokugqama kwe-LED umthombo wokukhanya, kancane kancane...
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