Abstract: A light diffuser includes a first elongated flexible sheet of material having a plurality of composite openings spaced regularly along the length thereof with each composite opening including two adjacent apertures and a connecting slot extending therebetween. The slots are provided to form cheeks on opposite sides thereof and the apertures are formed to receive a fluorescent tube therethrough. The cheeks are deformable to allow the lateral insertion of the fluorescent tube through the slot and into the two adjacent apertures after which the cheeks return to an original position to hold the fluorescent tube in the two adjacent apertures. A second elongated flexible sheet of material has serpentine edges and laterally outwardly extending tabs formed in the serpentine edges. The tabs are positioned to be engaged, one each, in the longitudinally extending slots in the first sheet to engage the second sheet with the first sheet.