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In 2009, the National Institute of Standards and Technology (NIST) issued a scientific paper stating that in addition to the typical white light brightness rating of display devices, there was a need for providing "an equivalent measurement that will better describe a projector's color performance when rendering full color imagery".
A scialytic lamp from the 50's A modern surgical light.Operating room lights are meant to suppress any shadow so that the surgeons have a deep light to use while doing procedures.