if you wanted to reduce the brightness on every model in your sequence you can go into an editor (I would use notepad++ You are not allowed to view links.
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replace
"ID_SLIDER_Brightness=100"
with
"ID_SLIDER_Brightness=60"
now the maximum brightness of 100% has been changed to 60%
be sure to do a "File,Backup" first so you have copies of all your xml files.
the brightness slider allows you to reduce the brightness on each effect, we do not have it so it works on all effects on a model., the method i showed above is the only way at this time.
btw, most effects dont look any different until you go below 50%. experiment.