This TriOptic™ lens kit for D2 lights is designed to maximize visibility in foggy and rainy conditions. Both the amber and selective yellow lens colors enhance visibility in fog and rain by blocking blue light frequencies, which reflect off water vapor and reduce visibility. The kit includes two spot lenses and two flood lenses. The spot lenses are optimal for good long-distance visibility, while the flood lights emit a conical light that provides excellent visibility of the roadside. Our recommendation is to create a True-Hybrid setup by installing the flood lens on the right side and the spot lens on the left side, thus getting the best of both worlds.