I bought a Manker U11 and BLF A6 together and the Manker U11 tint is very very warm, definitely not a 3D tint which it advertises as. The BLF A6 also claims to use a 3D tint which has no issues. I have taken some pictures of the two of them side by side with a third light, Gloworm XS, using a 3C tint LED. Anyone with a Manker U11 can confirm that theirs is too warm as well?
Even within a tint bin there will still be a range of tints. A sample that is right on the edge of a binning category will look more like the bin next to it, than a LED of the same bin, but right at the other extreme.