The Sun doesn’t produce yellow light for the most part.
Sunlight is white.
The definition of Sun + blue atmospheric sky at midday is 6500k and this is the colour that should be displayed when you choose 255,255,255 as an RGB value.
If you are using other correct kelvin values, then the lighting should be cohesive.
I have not set sun light color… but I think color temperature setting in Enscape might be effecting it which in my case set to 6843k.
all my light fixtures have RGB 255, 206,106 set to them, and extra lights which I have used to enhance my scene does not have any color set to them. they are in default Enscape color.
If I have correctly understood your point then you say that all my light fixtures should have 255,255,255 set to them.