Twowings awedwa 6 Lamp Fluorescent High Bay Light T8 Fixture HBA-632-UNV-ISH, White The Alpha series is an outstanding solution for high mounting height industrial or retail applications. The HBA optic has been optimized to provide maximum performance from either the T5 or T8 lamps. The primary benefits include exceptional color rendering, high system efficacy, 95% lumen maintenance, long lamp life, instant on/instant re-strike, economical dimming, and uniform brightness control.