How We Compared the Lamps
This is a desk-research shortlist: we compared manufacturer specifications and list prices, checked September 14, 2026, not burn times we measured ourselves. The Listed Price column shows each manufacturer's own list price in the currency it publishes. We ranked the four primary lamps on what matters over a 24-hour or multiday night: sustained brightness, runtime on a medium setting, weight and balance, and rain resistance. The Nitecore is listed last because it is a backup light, not a primary lamp.
#1 — Petzl NAO RL
The NAO RL specification page lists 5–40 hours for the reactive Standard setting and 2–24 hours for reactive Max Power; fixed-output Standard is listed at five hours. Plan on the low end of the range: for a 12-hour night, carry one spare battery and swap it at a crew stop around midnight.
#2 — Ledlenser NEO9R
The NEO9R manufacturer specification lists five hours in Power mode (600 lumens), 12 hours in Mid Power, and 120 hours in Low Power, with an IP54 rating and a magnetic USB-C charging system. Its boost figure should not be used for an overnight battery plan, and at 199 g it is the heaviest lamp in this comparison, so run a full night in it before race day. Ledlenser lists it at EUR 115.00; there is no manufacturer US list price, so budget from a US dealer quote.
#3 — BioLite HeadLamp 800 Pro
The HeadLamp 800 Pro specification page gives two different runtime sets for the same settings: regulated output holds brightness and is listed at 7 hours on High and 8.5 hours on Medium, while constant output runs down and is listed at 2 hours on High and 4 hours on Medium. Low is listed at 150 hours. The 800-lumen figure is a 30-second burst per activation, not a mode you can plan a night around.
Who it is for: a runner who wants a genuinely bright front beam, a rear red light, and pass-through charging from a power bank, and who is willing to carry 150 g on the forehead to get it. BioLite still charges the lamp over Micro-USB rather than USB-C, which we confirmed on the current product page—if every other cable in your drop bag is USB-C, that is one more thing to pack and lose.
Against it: the weight is all front-mounted, the headline lumen number is a burst, and the two runtime tables mean you have to decide in advance whether you want steady brightness or the longer, dimming figure.
#4 — Silva Trail Runner Free 2 Hybrid
The Trail Runner Free 2 Hybrid specification page gives burn times as ranges rather than single numbers: 1.5–3 hours on Max, 4.5–8 hours on Med, and 7.5–12.5 hours on Min. The ranges exist because the runtime depends on which battery you have in the rear case. Silva lists the lamp at SEK 999; it does not publish a US list price, so check a US dealer.
Who it is for: a runner who dislikes front-heavy lamps. Moving the battery to the back of the head is the reason this lamp is 113 g total but only 60 g on the forehead, and the AAA fallback means a dead pack at 2 a.m. is solvable with cells from a crew box or a gas station rather than a power bank and a wait.
Against it: 500 lumens is the lowest maximum of the four primary lamps here, the published runtime is a range that depends on which battery is in the case, and IPX5 covers spray, not immersion. A rear battery case also adds a second thing to seat correctly under a hat or hood.
#5 — Nitecore NU25 MCT UL
The manufacturer's name for this lamp is NU25 MCT UL—"MCT" for its three color temperatures (warm, neutral, and cool) and "UL" for the ultralight build. It is a different product from the heavier NU25 and NU25 MCT, so check the exact suffix when you buy. Nitecore's official store lists it at $36.95.
Who it is for: anyone who has to carry a mandatory backup light and does not want to feel it. At 47 g it is a third of the weight of the BioLite, and the 45-hour figure makes it credible as an emergency reserve. The red mode and the warm color temperature are also useful in a crew tent at 3 a.m.
Against it:the battery is built in, so there is no swap at an aid station—only a recharge from a power bank. The 400-lumen maximum is not a sustained setting, and Nitecore's 45-hour figure is a maximum-runtime claim on a low output, not an all-night usable beam. Use it as a backup, or as the main light only on a lit track or a well-marked road loop.
How to Choose
Start with the course: Match the beam and sustained output to terrain, speed, markings, and weather.
Plan from the intended setting: Do not calculate runtime from a maximum-lumen or boost figure.
Test the complete system: Wear the lamp with its battery, hat, and hood; verify controls with cold or wet hands.
Always: Carry an independent backup light and the cables or spare batteries your race plan requires.
For race planning, read the headlamp and battery strategy guide.
Sources
- Petzl — NAO RL official specifications
- Ledlenser — NEO9R official specifications
- BioLite — HeadLamp 800 Pro official specifications
- Nitecore — NU25 MCT UL official specifications
- Silva — Trail Runner Free 2 Hybrid official specifications
- Product specifications and manufacturer list prices verified September 14, 2026 on the five manufacturer pages above; Nitecore's $36.95 figure comes from its official store listing because the product page does not show a price. Ledlenser publishes a euro price and Silva a Swedish krona price; neither publishes a US list price. Regional prices and availability can change.
- Multiday Running — Gear review methodology