NSZ tau pib hloov los ntawm cov neeg them ib txwm muaj nyob sab nraum zoov teeb tsa kev hloov pauv, ntau xyoo kev hloov pauv zoo, muaj ntau yam LED teeb tau hlub los ntawm cov neeg siv khoom. Xws li LED Street lub teeb Zy {1}}, LED siab}, LED siab}, lawv nrov nrov hauv kev ua lag luam.
