NACOGDOCHES, Texas — Ashley Wickramaratine, sales manager for Lutron Electronics Co. Inc., recently presented to two Stephen F. Austin State University interior design classes to discuss lighting controls and technological advancements in the field. During the presentation, students in courses taught by Dr. Mitzi Perritt, professor, and Sally Ann Swearingen, associate professor, learned about light sources, control zones, lighting groups, how light affects design, and new wireless and smart technologies.