Here are some tests of the 4000K Panda 2M, actually closer to 3800K. It showed a saturated red color accuracy —R9— of 75, and overall red wavelength dominance. The 5000K 90 CRI LH-351D, however, showed a very present dominant blue spike and a slightly lower R9 of 70. The 4000K SST-20 in Yajiami optics, however, performs very well. It has about the same to less blue then the 4000K Panda light, 10 more R9 points and a couple more R12 points, or saturated blue. The 3500K SST-20/Osram Square will reduce the blue spike further , as you can see for the 3500K spectral power graphs. The 3500K Osram Square also has even higher R9 value of close to 95. I don’t currently have the SPD/CCT for the 3500K SST-20, but expect less blue then the 4000K varient. As you can see the blue-spike at that point is no longer dominant, and more like a blue-bump. Please be careful using beamshots as the absolute definition as to what these lights will be in person. Camera settings are really easy to tweak/fudge, and can dramatically skew the view of lighted environments.
3500K is more a neutral color commonly used in offices/classrooms/malls/stores in fluorescent lighting. You’ve probably seen 3500K multiple times in passing, but recognized it simply as office lighting. 4000K is also commonly used, but that general range—3500K-4100K—for interior lighting in public spaces is pretty common. I believe Target uses 3500K in some its stores. 3000K is like halogen light. It looks quite brilliant with a slight halogen incandescent tone when seen alongside 3500K. Most cars have white halogen lighting at around 3000K with no color cast.