Here is how these two headlamps compare on the numbers. The HeadLamp 425 leans on low weight while the Vizz answers with brightness, so the pick comes down to which you value.
| BioLite HeadLamp 425 | Princeton Tec Vizz | |
|---|---|---|
| GearScore | 73✓ | 71 |
| Max lumens | 425 lm | 550 lm✓ |
| Weight | 2.8 oz✓ | 3.2 oz |
| Beam distance | 85 m | 85 m |
| Max runtime | 60 h | 135 h |
| Price | $60 | $52✓ |
| Battery | Rechargeable | AAA |
| Water rating | IPX4 | IPX7 |
Highlighted cells mark the better spec: HeadLamp 425 in blue, Vizz in amber. A blank spec is never counted as a win. Runtime is shown for context and is not scored, since makers publish it at different brightness levels. GearScore is the overall rating (0 to 100); re-weight it on the full headlamp comparison. Prices are current MSRP.
The BioLite HeadLamp 425 against the Princeton Tec Vizz is a study in priorities. The HeadLamp 425 wins on low weight, and the Vizz pushes back on brightness and price.
The HeadLamp 425 is 14 g lighter. The Vizz is brighter (550 vs 425 lm) and $8 cheaper. On the default GearScore the HeadLamp 425 leads 73 to 71.
Pick the HeadLamp 425 if you care most about low weight, which makes it the better call for counting grams on long miles. Pick the Vizz if brightness and price matter more to you, or you are focused on your priorities.
The BioLite HeadLamp 425. It is 14 g lighter than the Vizz.
The Princeton Tec Vizz. It is brighter (550 vs 425 lm) than the HeadLamp 425.
The BioLite HeadLamp 425, 73 to 71 on the default algorithm. You can re-weight the factors to match your trip.
It depends on your priorities. Go with the HeadLamp 425 for low weight, or the Vizz for brightness. The spec table above shows exactly where each wins.