As a former lighting designer for theater, this stuff interests me. Natural white and blue are tough to replicate. LED does a good job and at lower energy consumption.

Two scientists in Japan and one at the University of California at Santa Barbara were awarded this year’s Nobel Prize in physics for helping create the LED light, a transformational and ubiquitous source that now lights up everything from our living rooms to our flashlights to our smart phones
https://www.cnn.com/2014/10/07/world/europe/nobel-prize-physics/index.html