hmmm... you might have to set it yourself, through the console.
try these commands in game:
r_intensity "1.8" - This command increases the brightness of texture colors. With a low r_OverBrightBits, you may have to boost this to around 2 (default is 1). Keep experimenting until you find a brightness level you are comfortable with.
r_gamma "2" - This is the master command that adjusts the brightness level of everything in the entire game. All splash screens and menus, along with the actual game play is affected. The default value is 1, but you should usually make this higher, depending on the brightness of your monitor (and to compensate for a low r_OverBrightBits setting). Try 1.4, 1.6, 1.8, 2 etc until you find a good setting. When setting r_OverBrightBits to 0, you'll have to juggle around between r_intensity and r_gamma until you find something you are comfortable with.
thats a quote from this: Team Image Config Guide (
http://www.team-image.net/files/configguide.html)