Folding doors which are mounted on to the front of a light unit in order to control illumination. (Lighting)
Adjustable flaps on the front of a luminaire used to control the beam. See also shutters.
Handy blinders on the sides of lights that can be used to keep light from going everywhere. They can also be used to clip on a lighting gel. They get very hot when a light is on, so it is best to wear work gloves when adjusting them