[quote=Giancarlo]
By the standards and many other sources, Neutral White is 4000K-5000K. 5000K is the coolest Neutral tint, while 4000K is the warmest Neutral tint.
So the 3X, 4X, and 5X tint LED's are all considered NW. 1X and 2X considered CW, and 6X and 7X considered WW.
Best ref from CREE, look at figure 12, the chart on page 12 confirming this: http://www.cree.com/led-components/media/documents/LED_color_mixing.pdf
More info here: https://budgetlightforum.com/t/-/14230
Another useful ref here, but with some opinion thrown in: https://www.pflexpro.com/LED-tints-and-power-bins-s/1838.htm