A rechargeable equivalent weighs 95 grams and carries a 1,200 mAh cell that takes 3.5 hours to charge from empty. A set of three AAA batteries gives about 20 hours on the 80-lumen setting, or roughly 12 nights of two hours of camp use.
What a Lamp Actually Costs
A headlamp that runs on three AAA batteries costs about $15 at an outdoor shop. The same lamp, bought at a supermarket in a trail town, costs about $9. The batteries cost $6 for a pack of four. That is the entire economics of the thing, and it is the reason most people get this wrong: they spend $40 on a rechargeable lamp with a proprietary cable and then lose the cable in a hostel in the second week.
The numbers that matter are lumens per dollar, and they are not what the packaging suggests. A $15 lamp typically puts out 80 to 120 lumens on high. A $60 lamp puts out 400. You will use the 80-lumen setting about 95 percent of the time and the 400-lumen setting for maybe four minutes a night, usually to find a tent zipper. Pay for the cheap one. Spend the difference on batteries, which you will actually consume.
Weight is the other number. A three-AAA headlamp weighs 78 grams with batteries. A rechargeable equivalent weighs 95 grams and carries a 1,200 mAh cell that takes 3.5 hours to charge from empty. In a hostel with two outlets and four bunks, a 3.5-hour charge is a negotiation. Disposable batteries are a solvable problem anywhere with a shop. A dead integrated battery is a problem you carry.
The Battery Math Nobody Does
Alkaline AAAs lose roughly 30 percent of their capacity at 0°C and about 50 percent at minus 10°C. If you are sleeping at altitude or in a shoulder-season hut, your lamp dims before the batteries are actually dead. The fix costs nothing: keep the spare set in an inside pocket, not the top of your pack. Body heat holds them near 30°C and they behave like new.
A set of three AAA batteries gives about 20 hours on the 80-lumen setting, or roughly 12 nights of two hours of camp use. That is a useful unit. Six nights in a hut with a book and a cooking setup: bring one spare set. A two-week trek: two spare sets, 12 batteries total, 84 grams.
Lithium AAAs cost about $2.50 each and weigh 30 percent less than alkaline. They also hold capacity down to minus 20°C. For a high-altitude trip they are worth the $7.50 for a set of three; for a summer coastal walk they are not. Rechargeable NiMH AAAs cost $12 for a pack of four and lose about 1 percent of charge per day sitting in your bag, which over a three-month trip means they arrive at the trailhead at roughly 40 percent. Plan to top them up the night before, not the week before.
The Torch You Already Have
Your phone has a torch. It draws about 1.5 watts, which on a 4,000 mAh phone is roughly 9 percent of the battery per hour of use. It also produces a flat, wide beam with no throw, and it occupies the hand you need for the map or the tent pole. It is a backup, not a primary. Treat it as the thing you use for 90 seconds to find the lamp.
A $6 keychain light weighs 12 grams and puts out 45 lumens on a single coin cell that lasts about 4 hours. That is the actual emergency light. It lives on the outside of the pack, not inside it, because the emergency is usually a zipper in the dark, not a night navigation exercise.
Red Light Is Not a Personality
A red setting costs nothing extra on most lamps and does two things. It preserves night vision, which matters if you are looking at stars or trying not to wake four people in a dorm. It also makes you visible to others without blinding them. The 5-lumen red setting on a cheap lamp is enough to read a page at 30 centimetres.
The claim that red light does not attract insects is overstated. It attracts fewer than white light, not none. In a wet summer at 1,500 metres, a red lamp still pulls moths. What actually keeps insects off your face is a lamp with a diffuser, so the beam is a soft 180-degree wash instead of a hot spot pointing at your forehead. A strip of translucent tape over the lens costs nothing and does the same job.
Charging in Places With Two Outlets
A 10,000 mAh power bank weighs about 200 grams and costs about $25. It will charge a headlamp with an integrated battery roughly eight times, or a phone twice. That is a real number for a seven-day stretch between towns. The problem is the power bank itself: it takes 5 to 6 hours to charge from empty on a standard 5-watt USB port, and many hostel bunks have one outlet shared between four beds.
The workaround is a 20-watt charger, which cuts that to about 2.5 hours and costs $15. It charges the power bank while you eat dinner. If the outlet is occupied, a $12 multi-plug adapter with two USB ports turns one socket into three and makes you the most popular person in the room for about four minutes.
Solar panels are the wrong answer for most trips. A 10-watt panel the size of an A4 page produces about 6 watt-hours on a good day, which is 5 percent of a power bank charge. It takes 10 days to fill the bank. For a two-week trek with no town, that is worth carrying. For anything else, it is 300 grams of optimism.
What to Buy and What to Skip
Buy a $15 three-AAA headlamp with a red setting and a claimed 100 lumens. Buy a $6 keychain light. Buy a $12 multi-plug adapter. Buy two spare sets of AAA batteries at $6 each. Total: $45, plus the batteries you will actually burn through at about $1.50 a night of camp use.
Skip the $60 rechargeable lamp unless you are going somewhere with reliable power and no shops. Skip the solar panel unless the trip is longer than 10 days between towns. Skip the lantern, which is a headlamp taped to a water bottle with a diffuser, and which weighs 12 grams instead of 250.
The thing nobody tells you is that 90 percent of the value comes from the $15 lamp and the $6 light, and the last 10 percent costs the other $30. Pack the cheap ones. Keep the batteries warm. Point the beam at the ground, not at the person across the dorm.
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