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2. Color rendering index - Wikipedia

   en.wikipedia.org/wiki/Color_rendering_index

   Researchers use daylight as the benchmark to which to compare color rendering of electric lights. In 1948, daylight was described as the ideal source of illumination for good color rendering because "it (daylight) displays (1) a great variety of colors, (2) makes it easy to distinguish slight shades of color, and (3) the colors of objects around us obviously look natural".

3. Light - Wikipedia

   en.wikipedia.org/wiki/Light

   The study of light, known as optics, is an important research area in modern physics. The main source of natural light on Earth is the Sun. Historically, another important source of light for humans has been fire, from ancient campfires to modern kerosene lamps.

4. Paint - Wikipedia

   en.wikipedia.org/wiki/Paint

   High-gloss paint is a highly glossy form of paint that is light reflecting and has a mirror-like look. It pairs well with other finishes. It pairs well with other finishes. While it is highly durable and easy to clean, high gloss paint is known for obvious visibility of imperfections like scratches and dents.

5. Zoo TV Tour - Wikipedia

   en.wikipedia.org/wiki/Zoo_TV_Tour

   The Zoo TV Tour (also written as ZooTV, ZOO TV or ZOOTV) was a worldwide concert tour by rock band U2.Staged primarily to support their 1991 album Achtung Baby along with their subsequent 1993 album Zooropa, the tour visited arenas and stadiums from 1992 to 1993.

6. Spray drying - Wikipedia

   en.wikipedia.org/wiki/Spray_drying

   The spray drying technique was first described in 1860 with the first spray dryer instrument patented by Samuel Percy in 1872. [citation needed] With time, the spray drying method grew in popularity, at first mainly for milk production in the 1920s and during World War II, when there was a need to reduce the weight and volume of food and other materials.

7. Gallium - Wikipedia

   en.wikipedia.org/wiki/Gallium

   The semiconductors gallium nitride and indium gallium nitride are used in blue and violet optoelectronic devices, mostly laser diodes and light-emitting diodes. For example, gallium nitride 405 nm diode lasers are used as a violet light source for higher-density Blu-ray Disc compact data disc drives. [73]