Growing plants from seeds is fun and inexpensive, but you need to provide young seedlings with appropriate sunlight to grow into strong plants. How much light do seedlings need to grow and thrive?

Once upon a time, buying a lightbulb meant choosing an incandescent one of between 25 and 100 watts, depending on how bright you wanted the light to be and the fixture you were putting it in. You ...

A team of physicists, engineers, opticians and photonics specialists at Zhejiang University, in China, working with a pair of colleagues from the University of Cambridge, in the U.K., has found a way ...