Getting old and stiff but still have great peripheral vision. So my trail at night light still remains a AAA 2 cell mag lite so I don't have to turn my head to the side so much. I also like the long distance focus so I can see the eyeballs glowing in the dark long before I get there. I also use a multi led, variable focus headlamp in camp work where I need two hands. Can't say which is primary and which is secondary. I use them both. The two lights (plus two lighters) are the only duplications in my bacpacking kit. Well, maybe two shoes and two socks as well.