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Light up everybody In this episode there's a lot of information about the character of light and lighting hardware. To our eyes light is white, but light is always changing color and knowing how to describe it and measure it is very important to filmmaking.   Measuring light Two ways of measuring light is CRI, the Color Rendering Index and the Kelvin color temperature. CRI measures the strength of light and how consistent it is. CRI values are on each piece of professional lighting equipment and the best piece of information you can learn is to never buy a lamp that has a CRI below 90%. You can find useful information about CRI on GE's site, including graphs displaying the color consistency.   Kelvin measures the color of light. The two lights used most frequently in filmmaking are tungsten and daylight. Tungsten, which is a red/orange color, is about 3200 degrees Kelvin, Daylight, which is bluish is about 5600 degrees Kelvin. These values are not heat temperatures, they measure  color in a range