Skip to page content Mission Information


Testing Solid State Lighting Countermeasures to Improve Circadian Adaptation, Sleep, and Performance during High Fidelity Analog and Flight Studies for the International Space Station (Lighting_Effects)
Principal Investigator
Research Area:
Behavior and performance
Species Studied
Scientific Name: Homo sapiens Species: Human

This experiment record is for the flight study. For the ground-based version of the experiment, please refer to LSDA ID NNX15AC14G.

Currently, the International Space Station (ISS) uses General Luminaire Assemblies (GLAs) that house fluorescent lamps for illuminating the astronauts’ working and living environments. NASA has determined that, beginning in 2016, the GLAs will be replaced with Solid-State Light Assemblies (SSLAs) containing Light Emitting Diodes (LEDs). Engineers at Kennedy Space Center developed a prototype Solid-State Lighting Assembly (SSLA) that was successfully installed onboard the ISS during ISS Expedition 18. The investigators worked with engineers, scientists, and managers from Johnson Space Center (JSC) to revise the SSLA specifications so that the new lighting units would have a dual capacity to: 1) provide illumination for crewmembers’ working and living quarters, and 2) serve as a lighting countermeasure for crewmembers’ circadian and sleep disruption.

Once the new SSLAs are deployed on the ISS, the investigators plan to assess the acceptability, use, and impact of deployment of a dynamic lighting schedule aboard the ISS during operational flight missions on astronaut vision, sleep, alertness, circadian rhythms, and general well-being. Sleep, performance, and circadian rhythm data will be compared to those collected by their team and others during previous flight missions aboard the ISS, in addition to surveillance of medical and psychological health in collaboration with mission flight surgeons. This project will generate quantitative data and knowledge for the benefit of crew health, habitability, environment, and human factors in the design of future human space flight vehicles and habitats. The project also will provide guidance for flight surgeons, flight psychologists, and astronauts to help optimize sleep and circadian regulation during space exploration missions.

++ -- View more

Circadian rhythm
++ -- View more

Data Information
Data Availability
Archiving in progress. Data is not yet available for this experiment.

Caffeine consumption
Clicks off, number
Cognitive performance
++ -- View more

Mission/Study Information
Mission Launch/Start Date Landing/End Date Duration
Expedition 50 10/28/2016 04/09/2017 164 days
Expedition 51 04/09/2017 06/02/2017 55 days
Expedition 52 06/02/2017 09/02/2017 92 days
Expedition 53 09/02/2017 12/14/2017 102 days
Expedition 54 12/14/2017 02/27/2018 75 days
Expedition 55 02/27/2018 06/03/2018 96 days
Expedition 56 06/03/2018 10/04/2018 123 days
Expedition 57 10/04/2018 12/20/2018 77 days
Expedition 58 12/18/2018 03/14/2019 85 days
Expedition 59 03/14/2019 06/24/2019 102 days
Expedition 60 06/24/2019 10/03/2019 101 days

Human Research Program (HRP) Human Research Roadmap (HRR) Information
Crew health and performance is critical to successful human exploration beyond low Earth orbit. The Human Research Program (HRP) investigates and mitigates the highest risks to human health and performance, providing essential countermeasures and technologies for human space exploration. Risks include physiological and performance effects from hazards such as radiation, altered gravity, and hostile environments, as well as unique challenges in medical support, human factors, and behavioral health support. The HRP utilizes an Integrated Research Plan (IRP) to identify the approach and research activities planned to address these risks, which are assigned to specific Elements within the program. The Human Research Roadmap is the web-based tool for communicating the IRP content.

The Human Research Roadmap is located at:

+ Click here for information of how this experiment is contributing to the HRP's path for risk reduction.

Additional Information
Managing NASA Center
Johnson Space Center (JSC)
Responsible NASA Representative
Johnson Space Center LSDA Office
Project Manager: Jessica Keune
Institutional Support
National Aeronautics and Space Administration (NASA)
Alternate Experiment Name
Proposal Date
Proposal Source
2013-14 HERO NNJ13ZSA002N