The 5000k version is an excellent 5000k LED reviewed here, the problem is, it’s not 4000k 
. At higher CCT, the color rendering is more sterile bluish-whitish, which IMHO, and purely subjective (personal preference), is not the “best” color rendering. Shades of brown become more greyish, red becomes more violet, etc.
In the picture below, one of the question mark is 219b 4500k, the other is GT-FC40 4000k. The similarity is incredible. No other LED w/ 2000 lm output is like GT-FC40 4000k.
