Bulbrite CF23R40WW/DM 23Watt Dimmable Compact Fluorescent R40 Reflector, Warm White IC (Integrated Chip) based technology provides longer life when dimming compared to other dimmable CFLs Continuous smooth dimming down to 20 Percent lumen output Save up to 77 Percent in energy costs Equivalent to 100W Incandescent BR40 UL Certified