Sylvania 22W T5 Pentron Circline Fluorescent Bulb - FPC22/835 - Description: 22W, T5 Pentron Circline fluorescent lamp, 3500K color temperature, rare earth phosphor, 82 CRI. Average Rated Life (hr) 12000, Base 2GX13 Bulb T5, Manufacture Sylvania. Part number Sylvania-20712 Sylvania 22W T5 Pentron Circline Fluorescent Bulb - FPC22/835