What is EML? How to measure it?
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What is Equivalent Melanopic Lux Equivalent Melanopic Lux (EML) is a measure of light that considers its impact on our circadian rhythm. Unlike traditional lux it considers not just brightness but also the color spectrum to regulate circadian rhythm. Adequate EML supports better sleep, mood, and overall wellbeing by providing the right light signals at the right times, contributing to a healthier indoor environment. The International WELL Building Institute recognizes the significance of EML, incorporating it as a reference point in WELL Building Standard. Higher EML: It's suitable for spaces where you want to enhance alertness, mood, and overall well-being, such as o ces or daytime environments. Lower EML: It's suitable for spaces where you want a more relaxed atmosphere or when it's closer to bedtime, like in bedrooms or evening settings.

Well Building Standard v2, Q1-Q2, 2023 EML for workstations a. The following light levels are achieved for at least four hours (beginning by noon at the latest) at a height of 18 in above the work-plane for all workstations in regularly occupied spaces: Best at least 275 EML, Good at lest 150 EML b. The light levels are achieved on the vertical plane at eye level to simulate the light entering the eye of the occupant.

Well Building Standard v2, Q1-Q2, 2023 a. Electric lighting is used to achieve the following light levels: Best at least 275 EML, Good at lest 150 EML b. The light levels are dimmable. If automated lighting is used, it is automatically dimmed after 8:00 pm. c. The light levels are achieved in living rooms and kitchens at a height of 55 in in the center of the room. If workstations are present, light levels are achieved at a height of 18 in above the work-plane.

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