EUROLITE Diffuser Cover 20° for LED PST-40 QCL Spot is a separately sold frost filter accessory for the LED PST-40 QCL Spot. It provides a soft, homogeneous light output and produces a 20° beam angle. The cover has a length of 12.0 cm, a width of 10.8 cm and a height of 0.3 cm. Its listed weight is 0.03 kg. The manufacturer identifies the accessory as a diffuser cover with a 20° beam angle.