four metal flaps fitted into the colour runners on the fron of a fresnel or pebble convex lantern to control the spill of light. The flaps are mounted at 90' to each other, and the whole as sembly is rotatable
Hinged metal flaps on the front of a Fresnel or PC spotlight to adjust the edge of the beam.
Movable flaps attached to a Fresnel or PC lantern to shape the light beam.
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