You could be forgiven for thinking a pair of blue-light-blocking eyeglasses is your free pass to indulge in as much screen time as you can squeeze into a day. And while the verdict is only ...

This is often called night mode or dark mode. It changes the background from white to black. Install blue light-filtering apps on smartphones, tablets, and computer screens. They filter a lot of ...

A blue street light illuminates the intersection of Shawnee St. and E. Lynch Street in Durham, N.C., Nov. 26, 2022. Ethan Hyman ehyman@newsobserver.com This series from The News & Observer’s ...

But to simply illuminate a street with a white light, manufacturers often opt for the cheaper and more efficient blue-LED-and-phosphor-coating combination. The phosphor technique is sound ...

Learn more› By Kaitlyn Wells and Zoe Vanderweide If you believe the hype, blue-light blocking glasses will prevent headaches, decrease eyestrain, and help you sleep like a baby. But do they work?

In Vancouver, more than 100 blue or purple street lights have been reported to the city — the result of a manufacturing defect involving a coating on the light. The downtown intersection of ...