The Skylight Tube (model 2014ST) has a low-profile roof lens that looks like a typical skylight instead of a dome lens used by most solar tubes. The unit includes a durable outer polycarbonate lens with inner acrylic lens at the roof inlet, and a triple acrylic lens at the interior ceiling outlet. According to the firm, air gaps between each lens provide superior insulation and help the product achieve a solar heat gain coefficient of 0.20. The product is pending Energy Star. 866.446.0966. www.ussunlight.com.