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The photographs below show a sheet of polycarbonate partly laid over two cases at a time to compare their abilities to back-light a panel.

Above: Lumirescent Bright and Philips Poster Box Module.

Above: Philips Poster Box Module and Lumirescent Superbright.

Above: QuarterLite and Lumirescent Superbright.

Above: QuarterLite and GE Tetra Grid.

Above: GE Tetra Grid and Lumirescent Bright.

Above: GE Tetra Grid and Philips Poster Box Module.