Is there a good standard to use, for light settings? Or do we match against the default/vanilla dm-maps? Intensity/gl_modulate/vid_gamma are settings that really impact on how bright/dark a map is. What are the default values for these?
Lighting depends on what you want to achieve in each map and room, so there isn't any real standard values, just try to make them look like in iD DM maps, or as iD SP maps, which are usually brighter, also maintain the balancing between sourced lights and ambient lights.
Also, fiddling with those values isn't always the best option, as they have drawbacks: for example, intensity and vid_gamma tends to wash the textures (try with intensity 8 or vid_gamma 0.2 to see the effect clearly) (intensity also seems to increase the saturation in colored lights, so the map looks more colorful where they are used), and gl_modulate makes some entities (items, your own weapon, ...) glow a lot, overriding the lighting from static lighting, which is usually the source for colored lighting that lights on items. Gl_modulate tends to be more of a personal choice, if you want a more realistic look and get advantage of colored lighting or want to see every item clearly from afar. My advice, balance the three of them carefully.
If you want to know the default for any console command, just type the command without any value, ''intensity'' instead of ''intensity x'' for example and the console itself will tell you the current one. If you have changed something, the defaults are 2 for intensity and 2 for gl_modulate(the higher the brighter), and 1 for vid_gamma (the lower the brighter), or check them here:
I definitely don't want to change the values, especially not in an experimental way specific to my map. I was only looking for the default value of those settings. So the link you provided answered my question, thanks!