Nidaamka jirridda toosan ee LED-ga ayaa leh nidaam isku dhafan oo isku dhafan oo loo yaqaan jir-goynta, kaas oo ka horreeya warshadda. Dhererka ayaa si aan kala go 'lahayn u kala jajabin karaa, rakibaadda jirridda uma baahna saqaf dheeri ah oo iibso agab dheeraad ah. Sidaa darteed, waxay si weyn u gaabin kartaa xilliga dhismaha, yareynta qarashka rakibaadda, kharashaadka shaqada, iyo qarashka kaabayaasha ah ee ashtakooyinka.
7-da madaxiisa ee iftiinka iftiinka toosan ayaa gaari kara howlaha soo socda:
(1) L, n, n, e (nalka aasaasiga ah) + dareemayaasha / dhaansiyada + ku dhisan gurmad ahaan
(2) L1, L2, L3, n, n, e (nalka aasaasiga ah) + dareemayaasha / dilging
(3) l1, l2, n, n, e (iftiinka aasaasiga ah) + dareeraha / dhaansiyada + xaalad degdeg ah oo ku dhisan