When selecting a material for the light-emitting surface of the box, you have some options. Acrylic sheets allow the light to pass through clearly while protecting any components below. Glass would do the same job but is heavier. Plastic translucents sheets may yellow over time. Many people use frosted acrylic to diffuse the lighting evenly. In the end, acrylic seems to be the best all around choice- affordable, long-lasting and produces nice soft light.n