"FDA cleared" gets stamped on $49 Amazon panels and $500 "premium" devices alike, often the exact same hardware, cleared for the same generic claim. Clearance is a regulatory pathway, not proof a d...

We mapped 1999 positive light therapy studies onto a single chart. They span a 100,000× dose range, from milliwatts to watts, seconds to hours, and every one of them worked. Light is good for you. ...

A high CRI rating tells you a lamp renders (some) colors accurately. It doesn't tell you whether the spectrum matches sunlight. When thinking about replicating the spectrum of sunlight, that's the ...

Every wavelength in this device exists because your body has a receptor or substrate for it. Nothing is decorative.

Indoor lighting was designed to allow our eyes to see. The rest of our biology misses the sun. Most Bright Light Therapy for Seasonal Affective Disorder falls short.

Most red light therapy devices come from the same factories. Here's how to tell the difference when choosing the best red light therapy device instead of a rebrand…

Your body was built by sunlight and longs for you to get more of it. Humans are not domesticated indoor creatures.

There's only one reason to block blue light during the day. And a completely different reason to block it at night. Most blue blockers get both wrong.

Your body doesn't know what time zone you're in. It only knows what kind of light it's seeing. That's the problem, but it's also the solution.