Interior High Bay Fluorescent Fixtures - NEW HIGH BAY FLUORESCENT 4 LAMP AND 6 LAMP, T5, T8, T10, AND NEW T6 ULTRA HIGH OUTPUT (48" - available in 3000K, 5000K, 5500K, 6500K). Our 4 lamp High Bay fixtures outperform most 6 lamp fixtures with Miro-4 Polished aluminum reflectors!