The quality of light was determined by the shape of spectral. The disadvantage of RGB LED lights is the narrow spectrum which gives poor performance of color quality.
Well most cheap white LED was made using blue chip with yellow phosphor. This is the most simple way to get white light by mixing blue and yellow light. Better white LED use blue chip emission and covered by red and green LED phosphor to achieve wider spectrum and higher CRI value 95.
And there is also new LED technology using violet chip at 405 nm or 420 nm to activates blue, green and red three kinds of phosphors to get full spectrum that very close to natural daylight with CRI 98.
The question is duv ( distance from x,y CIE to black radiator line) should be strictly controlled to avoid reddish or greenish.
https://www.linkedin.com/pulse/high-cri-tlci-led-photography-film-television-lighting-kalvin-zhang?trk=hp-feed-article-title-publish
