If you have a great computer, like you said so, you should use lighting effects.
Much smoother than normal graphics, if you ask me.
Take advantage of your nice comp and go all out with the graphic settings.
I play with it On since the looks is rather noticeably for the better in my oppinion.
And yea, as Jona said, if you have a good machine then take advantage of it...
if you play with lights off the players looks like they have transparent skins. go with the lights on. like jona said take advantage of a good computer if you happen to have one
my system is fine , and ive seen screenies of people with equally fine systems , i just dont like how the players look with all the reflections on them , they just look pastic to me , i think personaly they over did it with the light reflections on the players