The Broncolor Barndoor Set for Siros L40 Reflector has 4 wings to direct the light. By a simple tension spring the barn door is safely fixed in the reflector, it can be rotated by 360 degrees which helps to adjust it at any required position. The wings are cut in a way that they may be shut closely and then prevent optimally from undesired, laterally emitted stray light, similar to a simple conical snoot. Each angle of the base plate bears also a clamp - therein, square filters with a side length of 17.6 cm may be mounted perfectly.