T2i works great under streetlights, for what I've tested so far.
This is a short film I did the other day, all done with natural/preexisting lighting, mostly streetlights and car headlights. It'll give you an idea of the general result in these situations.
Thanks for the footage perfect quality under that light conditions
What kind lens do you use ??
The focus on this camera's with low f is a big issue how did you focus only on the camera screen ??