You can buy a heavy u lock and leave it at work. I suggest you use two locks in combination though. A sturdy u lock and a thick chain or two u locks. I've had my wheel stolen before, it's not cool.

For the rear light I use a cygolite hotshot, USB rechargeable and bright. On the front I use a magicshine clone with bigger battery and diffuser lens. Both will run about 50 or less total