@Michel13, that question is answered in this Q & A with Hamilton students if you want to watch it. I don’t remember at what minute mark that question was answered.
There is also a thread on that subject here: http://talk.collegeconfidential.com/hamilton-college/2143302-light-dark-sides.html#latest
There really is no cultural divide between the light side and dark side. Believe me, both sides have the same Hamilton culture. Although there is sort of a running myth among students that the Dark Side is more creative people (art, music, literature, etc.) and the Light Side is more math/science students. This is mostly due to the academic departments that are located on each side of campus.
Do you know why the 2 sides of campus (College Hill Road splits the campus) are called that? The architecture on the dark side is the former Kirkland College, an all girls school across the street from the original Hamilton College. Kirkland College was built mostly in the 1960’s and the architecture on that side of campus is mostly dark brick. Hence the “Dark Side”. The original Hamilton College campus is mostly older stone buildings from the 1800’s and early 1900’s that are generally lighter in color. Hence the “Light Side”.
Students move freely back and forth and most students graduate having lived on both sides. I’d say in general the dorms on the Dark Side are quieter and the Light Side has some of the bigger dorms that are known for their partying.
I hope all that helps.