You need to narrow this down a bit.
"Natural look" can go anywhere from dark tannin stained to gin clear for one thing.
This is a high CRI 3000k COB w/ turface substrate.
Many wouldn't consider this "natural" for what ever reason..
OR.,. maybe "too natural"..
To be honest it is a bit too natural for me..
My usual advice is pick 2 whites that add and divide to a temp that ,at both full, you want.
Less light "waste"..
Say you want a "noon" or main viewing time to have a 6500k "look" then you need say 1:1 4000k/8000K =6000k
A 3000k/6500k 1:2 ratio = 5333 Nice neutral white..
5500 is typical daylight...the longest part of the day where it stays the same. but daylight ranges from 2000-3000 at sunrise through to 6500-7000 for an overcast day.
Colored LED's can add or fill in where most LED's are short.
i.e Cyan, "violet" far red (haven't got a handle on any part. need of this) , UV and to a certain extent deep red (660nm).
Just for fun.. a snippet of a Marineland "puck". Probably north of 10000k low output.
note the dull fish but "snapping green" plants..