NEone understand light decals?

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Ok... I have to admit that I was a bit off track
with my last topic... Sorry guyz...
But I've been informed of the right terminology...
I should of been asking about lighting decals....
Can NEone give me some advice or, even better... CODE
about light decals? I really can't figure out how
to subtract from the shadows (lightmaps) and it's really
anoying.... I really need some control over light\dark
shadows n stuff... especually for my kind of style I
try to bring to games... (check out my deviantArt page
if U want to see what I'm blabbering on about:
kalisme.deviantart.com
Not thst amazing... But it's what I do)

Pleeeeeeeeeeeeeeeeez help me!
I really have to get something finished... and this
problem is like the only real one holding me back :(
I'd be forever thankful if NEone could help this
young programmer\artist\designer....