The EUROLITE Diffuser Cover is a separately sold optical accessory for the CLS-9 QCL RGB/WW 9x7W fixture. It functions as a frost filter that softens and homogenizes the emitted light. The cover measures 15.8 cm in length, 11.6 cm in width and 0.2 cm in height, with a stated weight of 0.04 kg. No electrical or control interface is specified.