SYLVANIA QUICKTRONIC® PHO-DIM operates PENTRON HO, PENTRON HO circline, and DULUX® L T5 lamps over a wide (100-1%) dimming range. System PHO-DIM provides nearly twice the light output (188%) 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. System PHO-DIM is appropriate for lighting control for Aesthetic reasons as well as lighting management for energy conservation through daylight harvesting or building automation. Setting the standard for quality, system PHO-DIM is also covered by our quick 60+ warranty, the first and most comprehensive system warranty in the industry.