During a power cut, a rechargeable LED lamp is safer and lasts far longer than the alternatives. Candles run 4-8 hours and carry a real fire risk; a phone torch runs 3-5 hours and drains the device you need; disposable-battery lanterns are usually flat when you need them. A rechargeable lamp such as Tavellio's Tess or Tessa runs around 10 hours at full brightness and up to 120 hours dimmed on a 5200 mAh battery, charges over USB-C, and is already charged because you use it every evening anyway.
Power Cut? Why a Rechargeable Lamp Beats Candles and Your Phone Torch
When the lights go out, the thing that matters is what is already charged. Here's how the options compare, and how to keep a home calm and safe through an outage.
A power cut is rarely dangerous, but it is disorienting. Storms take out lines, grids trip, works outside cut a cable, and suddenly you are on a dark landing feeling for the stairs with a phone in your teeth. Most households discover in that moment that their emergency plan is a drawer of dead batteries.
It is worth thinking about in advance, because the difference between a stressful evening and a fine one is small.
The usual options, honestly compared
| Runs for | Safe? | The catch | |
| Candles | 4–8 hours | open flame | fire risk, especially with children, pets or a long night |
| Phone torch | 3–5 hours | safe | drains the one device you need for news and calls |
| Disposable-battery lantern | varies | safe | the batteries are usually flat or missing when you need it |
| Rechargeable lamp | 10–120 hours | safe | only works if you kept it charged |
Candles are the traditional answer and the riskiest one. Fire services see a clear rise in house fires during outages, precisely because tired people put naked flames on furniture in unfamiliar places. A phone torch is safe but self-defeating: you are burning the battery of the device you need to check when the power is coming back.
A rechargeable lamp has the opposite profile. It is a sealed LED with no flame, it can be carried and set down anywhere, and, crucially, it runs for a very long time.
Why runtime is the number that matters
Most outages are over in an hour or two, but the bad ones, after a storm, can run into a second day. That is where runtime stops being a spec sheet detail and becomes the whole point.
This is the part of a lamp we care most about at Tavellio, and it is why we develop our own battery and LED technology instead of buying in the cheapest module. Our Tess and Tessa carry a 5200 mAh battery that runs around 10 hours at full brightness and up to 120 hours dimmed. Dimmed low, which is all you need to move safely around a dark house, that is not one evening. That is the better part of a week.
And when it does run down, it charges over USB-C, from a laptop, a car or the same power bank you use for your phone. No hunting for a specific battery size.
What to do before it happens
Keep at least one lamp per floor, and one within reach of the bed. A lamp in a drawer downstairs is no use on a dark landing.
Charge them fully and check them a few times a year, for example when the clocks change. A rechargeable lamp holds its charge well in standby, but nothing survives two years of neglect.
Put a wall lamp with a motion sensor on the staircase. This is the one that genuinely earns its place: a Tess on a magnetic plate needs no wiring, so it keeps working when the house has no power, and it lights the stairs by itself the moment someone walks to them. Stairs in the dark are where outages actually cause injuries.
Use the warm, dimmed setting rather than full brightness. It stretches the runtime enormously and it keeps a house that has lost power feeling like a home rather than a corridor.
Being straight about what these are
These are design lamps that happen to be very good in an outage, not emergency equipment. They give warm, safe, long-running light so you can cook, eat, read and put children to bed calmly. For crawling into a loft to find a fuse, keep a torch as well.
The advantage is that, unlike a torch or an emergency lantern, these do not sit in a cupboard waiting for a disaster. They are lamps you use every evening anyway, which is exactly why they are charged when you suddenly need them.
Want to understand runtimes and battery care better? Read our explainer on battery, charging and maintenance, or how bright a lamp really needs to be. New to cordless lighting? Start with the complete guide to rechargeable lamps. Off-grid for happier reasons? See our camping and caravan picks.
Browse all cordless wall lamps and rechargeable lamps.
Frequently asked questions
What is the best light to use during a power cut?
A charged rechargeable LED lamp. It has no flame, can be carried and set down anywhere, and dimmed low it runs for days rather than hours, unlike candles or a phone torch.
How long does a rechargeable lamp last in an outage?
Depending on the setting, around 10 hours at full brightness and up to 120 hours dimmed on a 5200 mAh battery. Dimmed light is all you need to move around a dark house safely.
Are candles dangerous during a power cut?
They carry a real fire risk. Outages are exactly when people place naked flames in unfamiliar spots, and fire services see house fires rise during them. A sealed LED lamp removes that risk entirely.
How do you charge a lamp when the power is out?
Over USB-C, from a power bank, a laptop or a car socket, the same way you would charge a phone. No specific battery size to hunt for.
How should you prepare for a power cut?
Keep at least one charged lamp per floor and one within reach of the bed, check them a few times a year, and put a motion-sensor wall lamp on the staircase, since stairs in the dark are where outages cause injuries.
