Check this on the Other section. Read the description.
I assume you're referring to
this? Thanks, I've looked at it several times, but it's not quite what I'm looking for, although at least it lists the range for ogl_spec. I've also looked at cmdline.cpp in the FSO source tree, which confirms the range for ogl_spec (FSO enforces it), although even that file doesn't tell me more than whether the different settings are integers or decimals.
I apologize to everyone. I'm slowly learning to be more precise with what I'm asking for and why I'm asking for it. I explained the "why" above. Here's the "what":
For each of the six non-Boolean lighting settings (-ambient_factor, -spec_exp, -spec_point, -spec_static, -spec_tube, -ogl_spec), I would like to know its smallest and largest possible values (or, if there is no minimum/maximum, the smallest/largest value that someone might reasonably use), and if the setting is a decimal value (that is, not an integer), the largest reasonable increment that someone might use for that setting (0.1? 0.01?). Consider that decimal precision is limited anyway (for example, 3.01 might not really be represented in the computer as
exactly 3.01) by the limitations of
computer arithmetic. For the record, FSO considers -spec_exp, -spec_point, -spec_static, -spec_tube, and -ogl_spec to be decimal values but -ambient_factor to be an integer.
Thanks for your help.
Radio things would be awesome to have in the launcher. My big thumps up to that!
Glad you like the idea!

And thanks for your idea about presets that people make themselves.