Walk down any flashlight aisle and you'll see numbers everywhere: 800 lumens, 230°, IPX4, 1200 mAh. Some of them matter a lot. Some of them are marketing. Here's a plain-English guide to reading a spec sheet so you buy the light that fits the job — not the biggest number on the box.
1. Lumens: total light, not usable light
A lumen measures the total amount of light coming out of the front of a light. More lumens means more light overall — but it doesn't tell you where that light goes.
Rough guide for real-world use:
- 20–100 lm: reading, finding keys, walking a lit street.
- 150–300 lm: most household tasks, engine bays, campsites.
- 400 lm and up: lighting a whole yard or throwing light down a trail.
Keep in mind that lumen ratings are usually measured at full charge, in the brightest mode, for the first moments of use. That's why we call them “rated” on our product pages.
2. Beam pattern: the number most people ignore
Two lights with identical lumens can feel completely different. A spot beam focuses light into a tight circle that reaches far but lights very little around it. A flood beam spreads the same light wide so you can see your whole work area.
For close work — an engine bay, a cabinet, a tent — a wide flood almost always beats a bright spot. That's why lights like the Halo 230 use a wide COB band, and why the Floodline uses a single large panel. When you need distance too, look for a light with both, like a COB flood plus a small spotlight.
3. Runtime: read the fine print
Runtime is usually listed as a range, like “3–6 hours on high, 10–16 hours on low.” The high number almost always refers to the lowest mode. Ask yourself how long you'll really need light in the mode you'll really use. For a power outage, long low-mode runtime matters most — which is why the Fold 360 is a favorite for the emergency drawer.
4. Battery and charging
Battery capacity (mAh) gives you a rough idea of how much energy is on board, but efficiency matters just as much. What matters more day-to-day is how you charge it. USB-C means you can top up from the same cable as your phone, in the car or from a power bank. No more drawers full of dead AAAs.
5. Water resistance (IPX ratings)
- IPX4: splash-resistant from any direction. Rain, snow and spills are fine.
- IPX6/IPX7: heavy water jets or brief submersion.
- “Water-resistant” with no rating: treat it as light rain only.
6. The spec that isn't on the box: how you'll hold it
The best light is the one that frees up your hands. A magnet that sticks to a fender, a clip that grabs a cap brim, a hook, a headband — these features change how useful a light is far more than an extra 100 lumens.
The short version
- Pick beam pattern first: flood for close work, spot for distance.
- Check runtime in the mode you'll use, not the best-case number.
- Prefer USB-C and a hands-free mount.
- Treat lumens as a rough guide, not a promise.
Not sure where to start? Browse our Warden Essentials — six lights that cover almost every job.