One thing you might try is turning up your ambient light level on the launchpad. I usually have mine set at 5-10, which allows me to just make out a nearby ship or station, while still keeping things nice and dark (enough to make rendezvous a bit easier, although I still like to perform dockings and EVA's in the daylight). It's not even too terribly unrealistic, since in real life you would have the stars and sometimes moons/planets to provide illumination.
Or you can just wait for the next version of Orbiter, which should (with the right graphics client) support all sorts of dynamic lighting goodies, including work lights.
EDIT: Just noticed that Chupacabra already mentioned the Ambient lighting. Reading ftw lol. :lol: