The 10374LENS is a 4 ft. replacement prismatic acrylic lens for the 10374EB and 20374EBHPF fluorescent wraparound fixtures. It can also serve as a replacement lens for the ACW-20-4H LED wraparound fixtures. The 10374LENS blocks 80% of harmful UV rays at 400nm. For replacement, the 10374LENS features a groove and lip design that allows the lens to easily slides into one end of the light fixture. This also ensures the lens stays securly fixed into place. The 10374LENS is protected by NICOR's 1 year limited warranty.