To be more energy efficient, many people have replaced their incandescent lights with light-emitting diode (LED) bulbs. However, those currently on the market emit a lot of blue light, which has been ...

Light-emitting diodes (LEDs) are so ubiquitous that it's easy to forget just how much society relies on these underappreciated technological wonders. Yet, the history of the LED goes back further than ...

Researchers have designed and tested ‘human-centric’ LEDs that emit different wavelengths of blue light depending on whether it’s daytime or nighttime, reducing the disruptive effect artificial light ...

Combining red, green, and blue LEDs (light emitting diodes) to form a light source is an attractive proposition. Such a multi-color light source can generate a wide range of colors. The LEDs ...

Spurred by a desire to lower energy costs, cities and towns in the area — and throughout the country — are overhauling their street lights. One after another, high-pressure sodium lights, a longtime ...