One of the great benefits of using a clear polycarbonate sheet is its excellent light transmission. The exact amount of light that a polycarbonate sheet lets through can vary based on thickness and type. Solid polycarbonate allows through more light than Twinwall polycarbonate tends to, but even multiwall lets through a great amount of light. For example, Axiome 10mm clear sheets have an 81% light transmission.
For specific light transmission stats please check out our technical brochure for your relevant thickness.