Bulbrite FC12T5 830 40 Watt Circline Fluorescent T5 Bulb, 800 Series, 3000-Kelvin, 2GX13 base, 12-Inch Diameter, Warm White 3350 lumens Long Life (10,000 hours) 12-Inch Diameter Energy Wiser Circline bulbs available in 6-Inch, 8-Inch, 9-Inch, 12-Inch, and 16-Inch Diameters TCLP and ROHS Compliant