DOE is focused on identifying opportunities for the optimi­zation of tunable lighting systems -- from analyzing data collected by the lighting system, to furthering understanding of how occupants use tunable lighting controls -- and making sure that LED technology reaches its full potential for energy savings and other benefits, such as improved control and quality. At the same time, growing interest in human health in the built environment is leading building owners and occupants to seek healthier buildings. This trend has aligned with rapid advances in LED technology, allowing for more control of light in the built environment than ever before. DOE is engaging with the researchers investigating biological response to light, to advance our understanding of the visual and nonvisual response of building occupants to various aspects of advanced lighting systems. Much of the existing research has occurred in controlled laboratory environments, and DOE seeks to better understand this relationship in realistic settings.

Healthcare Studies

Workplace Studies

Classroom Studies

Interior photo of a behavioral health unit, with assorted chairs and lots of windows.

Related Research


A Review of Human Physiological Responses to Light: Implications for Development of Integrative Lighting Solutions (Journal article, March 2021)


DOE testing of tunable lighting products highlights the variety of approaches used by manufacturers to achieve color tuning, and the challenges involved in understanding, testing, controlling, and specifying these products.

Learn more about evaluating LED color-tunable products.


Dim-to-Warm LED Lighting: Initial Benchmarks (July 2019)

Accelerated Stress Testing of Multi-Source LED Products (March 2018, July 2019)

Photometric Testing of Tunable LED Luminaires (January 2016, August 2018)