It's actually really easy to do! I'll show you. If you want to know what each lighting looks like, here's a link to a helpful Deviantart!
https://www.deviantart.com/0abarai0/art/Preset-Ambients-572557739So, here is some screenshot(s).
It should look like below.
Press enter, and paste in one of these lighting settings you want!
shading phong
ambient 0.1 0.1 .0 1
specular 0 0 0 0 128
shading phong
ambient 0.3 0.3 .0 3
specular 0 0 0 0 128
shading phong
ambient 0.5 0.5 .0 5
specular 0 0 0 0 128
Hold on there, there is still one thing left to do, you probably see "lighting off", it would take so long to do it manually! But that's no problem because, you can just click "Edit" then click "Replace.." type in "Find what" "lighting off" type in "Replace with" "lighting on"! Make sure to test in game to see if everything's alright! Once everything is fine, enjoy your cool looking, light-realistic FH characters! Also, if you're planning to use these ingame,(like I am currently!) you're gonna have to do all of these steps for "fmarkings" and "cmarkings" too.
OptionalIf you really want to make your game quite pretty and realistic, you can do these steps to the "terrain" material. You can also apply this to objects!