Lighting insufficient, solutions please!

Maybee It´s me getting old (41) or isn´t some battles rather dark in some occasions? Ex: Fighting in middle or northern Europe I can´t sometimes even see my units, just their banners - vagualy! I do realize that some argue for realism but I shure would like to see my units and the foe even if it´s dark, don´t you?

Now, in the "descr_daytypes" text file a certain value is set for a certain climate and time of year and the time of day for the battle is randomized. So isn´t it possible to change it all for max lighting? What value is max sun-light? If I can change this WHAT exactly do I change? (I already have my screen-lighting and resolution set at max) Thx for any input!