Re lights: remove the white headlamp when you leave your bike. They tend to disappear. I suspect it's something to do with rowing boats having to use a white light when out very early, and boaties "borrowing" them. I've actually given up, and now use a head-torch instead of it.
I always find I need gloves when cycling, otherwise my fingers freeze. Probably something to do with the fact that I go suicidally fast (see also: I actually wear a helmet, which a lot of people don't).
If you're bringing your bike from home or have a nice bike for some other reason, remember the 20% rule (spend 20% of the value of your bike on locks). Also remember that all the locks in the world don't do any good if someone can just throw it in the back of a van and then open the locks at their leisure. Finally, if your college doesn't have secure bike sheds, it's possible to pay to have your bike stored at a cycle shop in the vacations- you can also get it serviced then.