I have a zoomable head led flashlight. It is aimed so I get a nice fat (10ft wide?) spot that begins a few ft in front of me, and stretches a good bit forward (15ft?). I try to keep it low, otherwise light is wasted. In blinking mode, it's super obvious how high your beam is. I'm ok with nearby car tail lights, but if stop signs are blinking back at you, your light is too high. If street signs on traffic signal poles are blinking, your light is WAY too high!