what is special about Nichia 219B

well, that depends on the CCT and Tint of the particular LED BIN that is selected

for example on the left is a 4000k N219c (what people call neutral tint), that actually has a slight Yellow Tint above the BBL. In the middle is an N219b 4500k, with a subtle rosy tint, and on the right is an N219b 5000k with a slightly green tint, besides being blueish due to having a cooler color temperature.

in general the N219b at a given CCT, say 4500k, can still vary, some being more yellow, above the bbl, and some being more pink, below the bbl

imo the 219c tends to be slighly less rosy, and slightly more yellow green, when it does not land smack dab on the BBL (the neutral tint line)

note Im using Tint differently than most people… what they call Tint, I call CCT, Color temperature… the part with the K on the end of a number… The confusion comes from the terms Neutral White, and Neutral Tint. Some Neutral white Leds have Neutral Tint :slight_smile:

if you like videos instead of text…here is one about Nichia: