LOL. Notice the example Eric gives for "not overthinking your light" is a top-of-the-line, bells-and-whistles, auto-adjust Tikka RXP Petzl at an equally fancy price of $95. I would say plenty of thought went into that choice, and it's a cutting-edge lamp. You can get a Zebralight for $65, but I suppose that would be over-thinking it.
If you *really* don't want to overthink your headlamp, go get a Defiant or an Energizer at Home Depot. It might give up the ghost on your first night out but REST ASSURED, you won't have taxed any brain cells.
There's some odd juju about light discussions here. When they come up, you often get a chorus of people intoning that the discussion is too deep, that actual harm will come from continuing to think about or discuss the issue.
If you can't use your lamp to hike at night, and you find it impossible to change a battery in the dark, and you need a separate tool to open it...maybe, just maybe, you NEED to think a little bit more about your headlamp choice.
Now excuse me while I go and don't over-think my quilt, tent, sleeping pad, puffy and stove. All of them need de-thinking.
If I catch any of the rest of you thinking about your gear choices, there'll be hell to pay...