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 lower the Kelvin rating, such as the common incandescent/tungsten bulb, the warmer, softer and more yellow the light. The higher the K number, the cooler, whiter and bluer the light.
The concept of fluorescence was discovered in the late-nineteenth century, but due to its relative complexity it was not practical to mass produce fluorescent lighting until about the 1930s. However, fluorescent lights have gained more and more popularity due to their high efficiency, lower operating cost, and ability to fit into ever-smaller fixtures.
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