For as long as building construction has existed, architects and designers have recognized the power of the sun to provide natural light. In today's modern world, the architectural and design community continue to incorporate techniques that harness natural light to create comfortable, energy-efficient and aesthetically pleasing interiors. The Technical Services Division of the National Glass Association (NGA) has produced this Glass Technical Paper solely for informational purposes. This Paper was developed by dedicated member volunteers and subject matter experts. The original version of this document was published in 2017. This version of the document was updated and published in January 2024.