CHIRYO Light Therapy Healthy Lighting Guide FREE E-Book - Illuminating your health and home - by Samantha Thompson. displays scene of man using green light illumination in his bedroom - 2 children using amber light illumination in their bedrooms and a women sat on the edge of her bed using red healthy lighting to read a book

E-Book: Healthy Lighting Guide – 29 Pages

Healthy Lighting Guide

Illuminating Your Health and Home
Excerpt: The Impact Of Blue Light On Health

Blue Light (400nm-490nm)
Room Light Before Bedtime May Impact Sleep Quality, Blood Pressure, and Diabetes Risk

A study led by Dr. Joshua Gooley, published in The Journal of Clinical Endocrinology & Metabolism, found that evening exposure to room light significantly impacts melatonin, a hormone vital for sleep, body temperature regulation, and blood glucose control. This effect is particularly concerning for those frequently exposed to artificial light, such as shift workers.

Study Overview
Participants: 116 healthy adults (aged 18–30)
Duration: 5 days with controlled light exposure
Method: Participants experienced either room light or dim light for eight hours before bed, and
blood samples were taken to measure melatonin levels.

Key Findings
Melatonin Onset: Evening room light delayed melatonin onset in 99% of participants, shortening melatonin duration by 90 minutes.
Night-time Suppression: During typical sleep hours, room light suppressed melatonin by over
50% in 85% of participants.

This melatonin suppression may elevate risks for health conditions such as Type 2 Diabetes and
certain Cancers. Bright, blue-enriched light was noted as particularly disruptive, mimicking natural daylight and reducing melatonin—a critical cue for sleepiness.

CHIRYO Light Therapy Healthy Lighting Guide FREE E-Book Contents page
E-Book: HOW YOUR BODY WORKS WITH LIGHT – Mini-Book
Healthy Lighting Survey Shape the Next Big Innovation

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