Abstract: A light-control assembly including a modular beam with a plurality of adjacent circular bores separated by web portions, and a series of light-controlling members with laterally compliant edge structures mounted in the beam so that the edge structures accommodate the webs between the bores when the light-controlling members are closed to achieve enhanced, blackout or near blackout light-blocking along the edges of the light-controlling members.

Abstract: A panel unit with interlocked first and second engagement members each having panel-receiving cavities for receiving and retaining edge portions of panels, two pairs of opposed transparent or translucent panels mounted in the cavities of the first and second engagement members, in which the panel units are subject to positive and negative forces which may cause the engagement members to pivot with respect to each other and the first engagement member has catch rails for engaging sidewalls defining an interlock cavity in the second engagement member to limit the pivoting movement of the engagement members.