Circadian Health Glossary
M-Edi (Melanopic Equivalent Daylight Illuminance)
m-EDI stands for Melanopic Equivalent Daylight Illuminance, a measure of light's effectiveness in stimulating the intrinsically photosensitive retinal ganglion cells (ipRGCs) in the eye. These cells play a crucial role in regulating the body’s circadian rhythms by responding to specific wavelengths of light, primarily blue light. Unlike traditional lux measurements, which quantify the overall brightness of light as perceived by the human eye, m-EDI focuses on the biological impact of light, particularly its ability to influence circadian health and melatonin suppression.
Why Is m-EDI Important?
- Helps evaluate how well a light source supports circadian alignment.
- Used to design circadian-friendly lighting in workplaces, homes, and therapeutic devices like light therapy glasses.
- Assists in creating optimal lighting conditions for improvingsleepquality, alertness, and overall well-being.
Example: A light therapy device like AYO uses wavelengths designed to provide high m-EDI levels, ensuring effective circadian stimulation.