Hillevi Hemphälä has 20 years of experience from research into the impact of light on humans. She is an optician from the beginning and a lighting designer after that, and researches synergonomics and light and health. Among her research areas we find several intervention studies and lab studies such as circadian lighting, glare from LED panels, TLM and its impact on the brain, development of a risk assessment method for the visual environment, VERAM risk assessment of the visual environment.