Yintoni i-T8I-LEDityhubhu ukukhanya?I-“T” imele “i-tubular” (imilo yebhalbhu) kwaye inani libonisa i-diameter kwi-8th ye-intshi.I-T8 inobubanzi obuyi-intshi eyi-1 (okanye i-intshi eyi-8/8), i-T5 inobubanzi obuyi-5/8 intshi, kwaye i-T12 inobubanzi obuyi-12/8-intshi (okanye i-1-1/2 intshi) ububanzi.