N.C. Gen. Stat. § 20-132: Acetylene lights.

Motor vehicles eligible for a Historic Vehicle Owner special registration plate under G.S. 20-79.4 may be equipped with two acetylene headlamps of approximately equal candlepower when equipped with clear plane-glass fronts, bright six-inch spherical mirrors, and standard acetylene five-eighths foot burners not more and not less and which do not project a glaring or dazzling light into the eyes of approaching drivers. (1937, c. 407, s. 95; 1995, c. 379, s. 18.1.)