This is a 10" diameter honeycomb grid louver for the Altman CD Star Par fixture. Grids and louvers are essential accessories for any lighting system. A grid alters the shape and intensity of the light output from your softbox when it is mounted on a light head. Consider a grid as a painter would a brush, or a sculptor would a knife, or chisel.
Honeycomb grids, louvers, and "egg crates" are rigid, or semi-rigid. The spread of light will be determined by the density of the honeycomb mesh, and the distance of the subject from the light. Unless specified otherwise, a grid mounted on a softbox will limit the spread of light to 40° from the face of the softbox.
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Altman 10" Honeycomb Louver for SPC-A - 1/4" Review