I am having some trespass trouble on our ranch in Wyoming. Wanted to set up on some 2 track roads with a camera. We have really open country with few trees and no lights from towns, so my fear is someone driving in/out at night will see the flash. Is the IR flash visible to someone driving through or would the black flash be the best? Guys can cruise at a pretty good speed down these trails and I'm just trying to get the plate numbers. What would be my best application for this scenario? Thanks for any help