Description: TCP 3201841K Circline Compact Fluorescent Light Bulb (CFLs) - 18W CIRCLINE T6 LAMP - 41K - T6 bulbs feature smaller diameters and fit more applications. Long life, 10,000 hour average rated bulb life. Save up to 75% in Energy Costs compared to similar light output incandescent bulbs.TCP 3201841K Circline Fluorescent Light Bulb