Battery Format Decides More Than Brightness
On a headlamp, the battery decides how the lamp fits your life. The Petzl Actik Core is a hybrid: it ships with Petzl’s rechargeable CORE pack, but it also runs on three AAA batteries. That makes it a good choice for multi-day trips where you might not be able to charge. The Black Diamond Spot 400 runs on AAA batteries out of the box and can take Black Diamond’s BD 1500 rechargeable pack if you want it. The Fenix HM65R uses a single 18650 cell charged over USB-C on the lamp, and it can also run on two CR123A cells.
The Fenix is clearly the brightest, with 1,000 lumens from its spot LED and 400 lumens from a separate flood LED. Separate beams let you light the trail far ahead and the ground at your feet at the same time. The magnesium housing and IP68 rating also make it the toughest of the three, but it is the heaviest once you add the battery, which Fenix does not include in its 97 g figure.
The Spot 400 is the lightest of the three and, at IPX8, rated for submersion. The Actik Core is only IPX4, which handles rain but not submersion.
How to Read Headlamp Specs
- Lumens: 300–600 lumens covers camping, hiking and household jobs. Above 1,000 lumens is useful for trail running, search or technical terrain.
- Beam distance: Measured to the point where the beam drops to 0.25 lux, about full-moon brightness. Useful for comparing lamps, less so for predicting what you will see.
- Runtime: Lamps step down from their highest mode to protect the battery and LED. Look at the runtime of the mode you will actually use.
- Red light: Red mode preserves night vision and does not blind people around you at camp.
- Weight on the head: Under 100 g is comfortable for most people for hours. Heavier lamps feel better with a top strap.
Which One Should You Choose?
- Petzl Actik Core: Choose it if you want rechargeable convenience with AAA backup for longer trips.
- Black Diamond Spot 400: Choose it if you want a light, waterproof lamp at a low price and are happy with AAA batteries.
- Fenix HM65R: Choose it if you need the most light and a separate flood beam, for trail running or work at night.
Specification Notes
Petzl and Black Diamond publish burn times under the ANSI/PLATO FL1 standard, but their tables depend on battery type. Figures above come from the makers’ and authorized retailers’ listings; where they disagreed, we used the manufacturer’s own page.
Related Gearnode Guides
- Handheld light: EDC flashlights compared
- Keeping lamps charged off-grid: Foldable solar arrays compared
- Bag for the trail: Backpack suspension systems explained