This Feit Electric 4-watt MR16 low voltage flood LED light bulb has a GU5.3 base. Featuring bright white light and high 90+ CRI (color rendering index) rating this Enhance LED is our highest quality energy-efficient light with bolder color rendering and enhanced contrast so people and objects appear more realistic and vibrant.  This MR16 reflector produces a similar light output but uses up to 89% less energy than a standard 35-watt incandescent light bulb. The dimmable lights have an average life of 25,000 hours/22.8 years and are safe for indoor or outside use. Choose a dependable high quality 12-volt MR16 bulb for residential or commercial applications.