A method of manufacturing a diffuse reflecting optical construction comprising: providing a prefabricated light transmitting base optical substrate having first and second surfaces (29, 28); spraying a layer of a first hardenable light transmitting liquid polymer in an atomized manner, by means of an ultra-sonic spray nozzle, onto at least a portion of said first surface of said prefabricated light transmitting base optical substrate such that said layer becomes attached to said first surface of said prefabricated transparent base optical substrate as a random and continuous series of droplets forming what is hereinafter referred to as diffuse reflecting optical layer; curing said diffuse reflecting optical layer to a solid state in an open atmospheric environment, said cured diffuse reflecting optical layer having third and fourth surfaces, said third surface conforming to said first surface of said prefabricated light transmitting base optical substrate, said fourth surface comprising a random and continuous series of peaks and valleys corresponding to said random and continuous series of droplets; applying a reflective medium to at least a portion of said fourth surface of said diffuse reflecting optical layer, said reflective medium 5 being sufficiently thin to reflect only a fraction of light that impinges thereon, a remainder of the impinging light passing through said reflective medium, said reflective medium applied to said fourth surface representing a prepared fourth surface of said diffuse reflecting optical layer; applying an optical layer 6 of a second hardenable light transmitting liquid polymer to said prepared fourth surface of said diffuse reflecting optical layer; and curing said optical layer to a hardened state, said optical layer having a sixth surface and a fifth surface, said fifth surface conforming to the random and continuous series of peaks and valleys of said prepared fourth surface; said second surface of said prefabricated light transmitting base optical substrate and said sixth surface of said optical layer forming outer surfaces of said diffuse reflecting optical construction. providing a prefabricated light transmitting base optical substrate having first and second surfaces (29, 28); spraying a layer of a first hardenable light transmitting liquid polymer in an atomized manner, by means of an ultra-sonic spray nozzle, onto at least a portion of said first surface of said prefabricated light transmitting base optical substrate such that said layer becomes attached to said first surface of said prefabricated transparent base optical substrate as a random and continuous series of droplets forming what is hereinafter referred to as diffuse reflecting optical layer; curing said diffuse reflecting optical layer to a solid state in an open atmospheric environment, said cured diffuse reflecting optical layer having third and fourth surfaces, said third surface conforming to said first surface of said prefabricated light transmitting base optical substrate, said fourth surface comprising a random and continuous series of peaks and valleys corresponding to said random and continuous series of droplets; applying a reflective medium to at least a portion of said fourth surface of said diffuse reflecting optical layer, said reflective medium 5 being sufficiently thin to reflect only a fraction of light that impinges thereon, a remainder of the impinging light passing through said reflective medium, said reflective medium applied to said fourth surface representing a prepared fourth surface of said diffuse reflecting optical layer; applying an optical layer 6 of a second hardenable light transmitting liquid polymer to said prepared fourth surface of said diffuse reflecting optical layer; and curing said optical layer to a hardened state, said optical layer having a sixth surface and a fifth surface, said fifth surface conforming to the random and continuous series of peaks and valleys of said prepared fourth surface; said second surface of said prefabricated light transmitting base optical substrate and said sixth surface of said optical layer forming outer surfaces of said diffuse reflecting optical construction.