First thing to do on any K100 K75 is to fit relays with heavy gauge wire from the battery to relays. The standard wire is barely adequate, there is a post on how to do this.
Second step is to upgrade globe there are is a lot of information on what globe is best per dollar. You have more choices in the US. After you have done the first two then go for spotlights, in whatever format suits you, I have fitted one 6" LED light bar under my headlight. It works best in daylight but also night, to draw attention to my bike, since the installation it has definitely reduced close encounters of the car kind. We don't have deer here but we do have Roos where I live, and they would have to be one of the dumbest animals known to man. The only saving grace with them is they can't jump backwards, I have run over a Roos tail at over 110 Kph, and dodged a few more. Never hit one, although a girl I used to work with, had one come through her windscreen on the passenger side and kick her to death. We also have Emus & Wombats equally deadly but maybe not as dumb. Don't rely on deer whistles ( sold here as Roo whistles ) waste of money.
Regards Martin