useful photo thanks, it shows that the SDR50 (Samsung LH351d 5000K) has greener Tint, than NA52 (Nichia 519a 5700K)
I would choose Nichia (NA52), because it is less green, and higher CRI (better Red Color Rendering), than Samsung (SDR50).
The Nichia (NA52) is imo the Best Daylight White LED...