Over time, the big, clunky “gumball” lights were replaced with sleeker, more advanced light bars. Today’s police vehicles use ...

We know at a traffic signal we’re required to wait for the green light to go, but what if it never turns green? That’s what ...

Over the course of three months, we tested 11 red-light devices and found three favorites: an LED-packed wand, a user-friendly hard-shell mask, and a pliant soft mask with deep-penetrating LEDs.

A novel red LED using Eu-doped GaN is a promising component for next-generation micro-LED display with ultrasmall-size, full-color, and high-resolution. The LED exhibits narrow-band red emission and ...