The color of light, expressed in Kelvins (K). The sun is about 5800 Kelvins. This is called a "temperature," because the hotter fire gets, the more it changes from a warm yellow glow to white. The ...

Light is light, right? Not exactly. The light that comes from the overhead fluorescents at your office is probably nothing like the light that pours from your favorite chandelier at home or that of ...