A yellow lens cover will widen the output to increase side visibility. It softens the light to make it more comfortable to the eyes and is extra good for rainy or snowy weather. With the lens cover, the beam has 3839 actual lumens, and the range is 295 meters. It fits the Siberia X 4Ó driving light (Part No. 270971) and Siberia X 70W work light (Part No. 270978).