For Gen 1:
1)Log into ColorVu camera web GUI
2) Go to Configuration > System Settings > External Device
3) Set "LED Brightness Adjustment" to manual
4) Adjust "LED Brightness"
For Gen 2:
1) Log into ColorVu camera web GUI
2) Go to Configuration > Image > Day/Night switch
3) Set "Light Brightness Control" to manual
4) Adjust "White Light"