Dr.Mariana Figueiro, professor and director at Lighting Research Center at Rensselaer Polytechnic Institute discusses about the needs of entrained lighting for health in this series of videos. She talks about the lighting characteristics, which affects the biological clock in sync with circadian rhythms, calculated by circadian stimulus (CS) metric in place. Based on the CS Level, the amount of light exposure varies for older adults, shift workers, adolescents and office workers. Electric Lights help to deliver the desired CS Level to improve alertness, cognitive performance, sleep, mood, energy and health.