Okay.. but you're also talking about a light source that produces a strong enough light to reflect off a surface more than 1km away. I'm not particularly sure on the physics involved, but I'm pretty sure that this would essentially be a form of low focus laser. That's probably not saying much, but given that our own focused lasers require quite alot of energy just to reach a target 1-3km away, I'm tempted to think that an unfocused beam would need significantly more energy to not only reach >1km away, but also have enough energy to reflect back.
I have a
flashlight which throws a visible beam ~0.5 mile under ideal conditions, which is 0.8 km. The spot is easily visible on a light-colored target at that distance. There would be even less light scattering in the vacuum of space. According to Wikipedia, planes have landing lights which are visible up to 100 miles away:
https://en.wikipedia.org/wiki/Landing_lights
However, speaking of lasers... One obvious option for a hardpoint would be a
spectrographic sampling laser, like the ones on the Mars rovers. It should work much like a mining laser, but report back localized mineral compositions, much like a prospector limpet. A laser spectrometer would be useful to miners as well as explorers. Some of the other rover instruments would also be useful...
http://www.space.com/16801-mars-rover-curiosity-science-instruments-infographic.html
P.S. It's an awesome flashlight, but you have to be careful with it. It gets hot enough to seriously burn you if you touch the front end and might even start a fire if you leave it in contact with flammable materials.