http://www.youtube.com/watch?v=gj1rwFz_ffY

Well in the link provided at the time 1:08 shows the field they are in and I was wondering how they would light up the area...

It'd help if you've seen the movie cause I can't find a link to anything better when their in the field.

hey, it is hollywood
even if they need 200.000 watts and a nuclear powerplant to do it, if they decide to do it , they will do it.
on the other hand, if you are smart, color correction in post and few lights could do the trick as well.
a full moon night by clear sky would be nice too