Hey Dinki, hm, it might be OK if it appears normally as you said, but, unfortunatelly even the creator of Radiance Light System himself (called GunMod at MTS forum) said he has not clue about it - I mean the reason why it appears. So that means red light in dawn, for instance is not common to everyone as result of CEP+radiance installation. I don't know for you, but for me it is too red. You know everything become completely redish in dawn - it seems to me though as kind of mistake. Some other people comment it as similar as below:
http://www.modthesims2.com/showthread.php?t=101456&c=1What do you think?
If there is no this bloody red I would be so happy with such marvelous, realistic lightning effect GunMod created.