The difficulty is, what we feel like we're seeing isn't what we're actually seeing. The human visual system is a lousy judge of how well it's doing. It's not just you, it's everyone. We humans are just not well equipped to accurately evaluate how well or poorly we can see (or how well a headlamp works). Our subjective impressions tend to be very far out of line with objective, real measurements of how well we can (or can't) see. It's not because we're lying to ourselves or fooling ourselves or anything like that, it's because our visual systems just don't work the way it feels like they work.
