Light fixtures and multi-plane light modifying elements

A substrate attachment system comprising:

• a substrate having a first surface configured with at least one supporting edge truss configured from a corresponding fold in the substrate, the fold adjacent to a least one edge of the substrate, wherein the at least one supporting edge truss is configured at an angle relative to the first surface, and wherein the at least one supporting edge truss includes an outer perimeter edge;
• and
• at least one elongated frame member with a cross section comprising at least two segments, wherein the at least two segments define at least a first surface and an adjacent second surface, and wherein the adjacent second surface further comprises an edge truss retention feature;
• wherein the substrate is capable of being attached to the at least one elongated frame member such that the first surface of the substrate is disposed directly on the first surface of the at least two frame segments, and the outer perimeter edge of the edge truss is engaged by the edge truss retention feature on the adjacent second surface of the at least two frame segments.

A film tensioning system comprising:

• at least one film piece defining a film plane, and characterized by at least one supporting edge truss on two or more opposing edges of the at least one film piece, wherein each supporting edge truss is configured from a corresponding fold in the at least one film piece, and wherein each supporting edge truss is further configured to assist in the support of the at least one film piece in a substantially planar configuration;
• and
• a frame comprising at least one film attachment surface on each of two opposing sides of the frame, the film attachment surface oriented at an angle relative to the film plane;
• and
• at least one film tensioning device engaging both a supporting edge truss of the at least one film piece and the at least one film attachment surface of one side of the frame, and another at least one film tensioning device engaging both the opposing supporting edge truss of the at least one film piece and the at least one film attachment surface of the opposing side of the frame;
• wherein each film tensioning device is configured to pull a corresponding supporting edge truss and a film attachment surface closer together to impart tension within the at least one film piece.

A lens assembly comprising:

• an elongated structure comprising at least two opposing attachment features, wherein each of the at least two opposing attachment features comprise at least a first surface and an adjacent second surface, and wherein the adjacent second surface further comprises an edge truss retention feature;
• and
• at least one optical film piece defining an aperture plane and having a first surface configured with at least one supporting edge truss on at least two opposing edges of the optical film piece, the at least one supporting edge truss configured from a corresponding fold in the at least one optical film piece, the fold adjacent to at least one edge of the at least one optical film piece, wherein the at least one supporting edge truss is configured at an angle relative to the aperture plane, and wherein each supporting edge truss includes an outer perimeter edge;
• wherein the at least one optical film piece is capable of attachment to the elongated frame member such that a portion of the first surface of the optical film piece is disposed on the first surfaces of the at least two opposing attachment features, and the outer perimeter edge of each opposing supporting edge truss is capable of engaging with the corresponding edge truss retention feature wherein the aperture plane forms a curve.