Shop for TUFFAK® Lumen XT Polycarbonate sheets. TUFFAK® Lumen XT (formerly called Makrolon®) is a translucent polycarbonate product with a textured surface on one side specifically designed for lighting lenses. It offers a wide range of standard light diffusion levels as well as both a warm (LW) or a cool (LC) hue. Custom cuts and cut-to-size available. Stocked materials typically ship in 2-5 business days. Can’t find what you need? Get a quote.