Lighting Study on Alzheimer’s Patients Reveals Improved Sleep and Mood

A recent study by the Lighting Research Center at Rensselaer Polytechnic Institute found that a daytime lighting installation in a long-term memory care facility improved the health and well-being of patients.

Individuals with Alzheimer’s disease and related dementias often have trouble sleeping and experience daytime irritability. The study assessed whether customized daytime lighting could improve the sleep and mood of Alzheimer’s patients living in long-term care facilities.

The study included 43 subjects diagnosed with Alzheimer’s disease and related dementias. The subjects were exposed to customized lighting for 4 weeks, followed by an additional 4-week “washout” period.

The lighting used for the study utilized color tuning to alter the color temperature, output, and distribution of light and was placed in spaces where patients spent most of their waking hours .

The study outcome showed improvement in the subjects’ sleep quality, helping to build the case for more refined human-centric lighting installations for senior living and memory care facilities, hospitals, etc.

While early stage solutions like color tuning help build the case for healthy lighting, it falls short of delivering the exact light spectrum necessary to be considered true “circadian lighting.”

By only altering the color temperature of light by the time of day, color tuning does nothing to deliver the correct content of blue light during the day and safe level of less than 2% at night.

Learn more about the health risks of blue light at night, and what CIRCADIAN Light is doing to help.

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