SYLVANIA QUICKTRONIC High Efficiency (QHE) PROStart T5HO electronic ballasts operate PENTRON HO, PENTRON HO Circline, and DULUX L T5 lamps with full lumen output and optimal system performance. These ballasts provides nearly twice the light output (188 percent) of T8 systems, with the same number of lamps, allowing many new design options. One lamp fixtures can now be used in place of two lamp models.