Actually the lighting needs a little tweak. A negative (-) sign needs to be added to the program in places. I requested to fix the Sun's lighting on the trees about a 1 year ago and it was fixed. I keep hammering at to fix the surrounding lighting when viewing the Sun when this subject comes up.
When looking towards or at the Sun in real life your iris closes and lets in less light. What that means, for example, the inside of your cockpit/instrument panel should get darker (when looking into the Sun). The modeling in AH2 does the opposite, the instrument panel gets brighter.
If you want to test this out, just look out a window with a low Sun visible in the background. You will notice that the inside of the window frame and walls appear to dim.
The reason why the Sun has many complaints may be do to the reasons above. AH2 lighting may seem unnatural and messes with the brain.