Equivalent Melanopic Lux (EML) is a metric used in lighting design to measure how much a light source stimulates the human biological clock, rather than just how bright it looks to the human eye. While traditional "lux" measures the light…
By INDEX Editorial Team | Based on peer-reviewed research - Why winter lighting can change how you feel - If your mood reliably dips when days get shorter, you are not imagining it. Seasonal affective disorder (SAD) is a form…
By INDEX Editorial Team | Based on peer-reviewed research - If your mood drops every fall or winter, you feel more tired, and it’s harder to get going in the morning, you’re not imagining it. Seasonal affective disorder (SAD) is…
By INDEX Editorial Team | Based on peer-reviewed research - How low natural light and all‑indoor living can affect your mood—and what you can realistically change in your home lighting environment.
By INDEX Editorial Team | Based on peer-reviewed research>>> INDEX is a 501(c)(3) environmental health nonprofit. Our mission is to translate complex indoor environmental science—including lighting—into practical steps for healthier homes and workplaces. We do not sell lighting products. When…