[Bug] Sun intensity not scaling correctly

[Mjrlun]

When testing size-modifications for this patch-mod at 2.5x scale and larger, it became apparent that Solar intensity is not scaling correctly.

Note A: There is an additional atmosphere bug which is elaborated on a separate bug report.
Note B: 10.625 scale is used for these images, although it applies the same for 2.5x.

Solar intensity on Kerbin is way too low:

This starts to become way too obvious at Duna, where the surface is barely visible:

Dres is invisible (and going close do Dres makes the sun invisible also?):

All of the planets/moons past Dres are affected the same, but the atmosphere shaders appear to bind their direction to down:

It appears the planets are instead being lit by the skybox, strangely enough

Potential solution: The field assignment for "StarLuminosity" in Body settings is incorrectly named.

I tested changing the value for this setting (from rescale-factor^2 to rescale-factor^4) and it had no effect on the outcome.