Bulbrite FC12T5 835 40-Watt Circline Fluorescent T5 Bulb, 800 Series, 3500-Kelvin, 2GX13 base, 12-Inch Diameter - 2 Pack 2250 lumens Long Life (10,000 hours) 12-Inch Diameter High performance tri-phosphor used in T5 lamps for maximum brightness and color rendering TCLP and ROHS Compliant