Achieving 150 EML [136 M-EDI(D65)] is a strategy to support circadian rhythm in a project with a small amount of glazing. EML stands for Equivalent Melanopic Lux and M-EDI stands for Melanopic Daylight Illuminance. These are metrics that measure the intensity of light that stimulates the melanopsin receptors in the eye, which are responsible for regulating the circadian rhythm. The higher the EML or M-EDI, the more effective the light is for circadian entrainment. Feature L03: Circadian Lighting Design5 requires projects to achieve a minimum EML or M-EDI value for at least 4 hours per day in all regularly occupied spaces. For projects with a small amount of glazing, artificial lighting can be used to supplement the daylight and achieve the required EML or M-EDI value.
References:
* What is Circadian Lighting? - The Lighting Practice
* Circadian Characteristics of Special Glazing - atiner.gr
* Light and the circadian rhythm: The key to a good night's sleep?
* Why Light Matters: Designing with Circadian Health in Mind
* Feature L03: Circadian Lighting Design