The impact of this mod will be greatly enhanced if you increase your LIGHT and SPECULAR distances to the max.
Once CLARALUX is installed, we highly recommend using BETHINI to set your LIGHT VIEW DISTANCES to as high as you can manage without performance impact.
In the alternative, there are INI tweaks which allow for further LIGHT distances (please remember to backup your INIs before adding these adjustments) … if you’re a “digging around” type, here you go :
In SKYRIM.INI [DISPLAY] add/adjust:
In SKYrIMPREFS.INI [DISPLAY] add/adjust: