Experience the change, see the difference:Calculite 4" Round Gen3 features industry leading visual comfort, excellent uniform illumination over time, and patented installation flexibility.:Maximize visual appeal by three beam spreads options to give the right distribution and light output;Ultimate user comfort by providing 50 degree physical and 45 degree reflected cutoff, creating less brightness;Uniform light and color consistency at an SDCM of 2;Modular three piece design that makes servicing and upgrading convenient;Installation efficiency accomplished by a tool-free install and quick connect technology