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Red torches

Klarlight LST4555 625 nm night light

A tap-operated red night light at a published 625 nm with 20 and 100 per cent steps, charging over USB-C from a 300 mAh cell.

Klarlight 625 nm red night light

Klarlight LST4555 625 nm night light

A tap-operated red night light at a published 625 nm with 20 and 100 per cent steps, charging over USB-C from a 300 mAh cell.

Red output type
625 nm, as the maker publishes it · None — it is a diffuse light rather than a torch
Dimming range
Two — 20 % and 100 % — plus off, by tapping the body
Minimum
Not published by the maker.
Mode memory
Not published by the maker.
Battery type
300 mAh, rechargeable · USB-C, from any port or power bank
Cold behaviour
Not published by the maker.
Weight
Not published by the maker.
Attachment
Not published by the maker.
Amazon reference
B0GVSD49Q9 (same reference on 5 Amazon marketplaces)
EAN
5056776465517
  • Publishes its wavelength, which the astronomy torches on this shelf do not
  • A 20 per cent step is genuinely dim, which is the setting that matters
  • It is a night light: there is no beam and no way to point it

Best for: A red light beside a chair or on a table at the observing site, rather than in a pocket

≈ £13 / €15
Check price on Amazon

Specifications

Red output type
625 nm, as the maker publishes it · None — it is a diffuse light rather than a torch
Dimming range
Two — 20 % and 100 % — plus off, by tapping the body
Minimum
Not published by the maker.
Mode memory
Not published by the maker.
Battery type
300 mAh, rechargeable · USB-C, from any port or power bank
Cold behaviour
Not published by the maker.
Weight
Not published by the maker.
Attachment
Not published by the maker.
Amazon reference
B0GVSD49Q9 (same reference on 5 Amazon marketplaces)
EAN
5056776465517

Not a torch, and honest about it

A bedside night light, tapped to switch between off, twenty per cent and full. There is no beam, no clip and no strap. It belongs on a table beside a chair, not in a pocket.

The figure it publishes that the torches do not

Six hundred and twenty-five nanometres. Neither purpose-built astronomy torch on this shelf publishes its red LED’s wavelength, and this bedside lamp does. The dark-adapted eye is least sensitive at the deep red end, which is the entire reason red light is used.

The twenty per cent step

That is the setting that matters. A red light beside a star chart has to be dim enough that glancing at it does not undo twenty minutes of adaptation, and a fixed bright red fails at exactly that.

Where it belongs on this site

Next to a planisphere and an observing chair. As part of a set-up on a table it earns its place; as the thing you carry to find a dropped eyepiece it does not.

Availability

German, French, Italian and Spanish Amazon stores ran from 15 € to 19 € on the day of the survey.

British Amazon store lists it in local currency, which the euro range above sets aside.

American Amazon store gave no result whatever, so the buy button there opens a search rather than an empty page.

Figures as Keepa reported them on the day this page was last updated. Stock and pricing shift without warning.

Prices quoted in this text were read on 17 September 2026. The live price is at the top of the page.

What this fits

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    Red output type
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    Dimming range
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    Minimum
    Not published by the maker.
    Mode memory
    Red and COB side light are on a lower switch; white modes are on an upper switch
    Battery type
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    Cold behaviour
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    Attachment
    Not published by the maker.
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    Toys4Boys 630 nm dimmable red night light

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    Red output type
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    Dimming range
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    Minimum
    Not published by the maker.
    Mode memory
    Not published by the maker.
    Battery type
    Not stated in the extract
    Cold behaviour
    Not published by the maker.
    Weight
    Not published by the maker.
    Attachment
    Not published by the maker.
    Amazon reference
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    EAN
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    • The wavelength is published, at the deep red end where adaptation suffers least
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    UltraFire 501R red LED torch

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    Red output type
    620–630 nm, as the maker publishes it · The listing gives none
    Dimming range
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    Minimum
    Not published by the maker.
    Mode memory
    Not published by the maker.
    Battery type
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    Cold behaviour
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    Weight
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    Attachment
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The rest of this rack

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    Cited standard
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    Mounting security
    Not published by the maker.
    Image colour
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    Supplied storage
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    EAN
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    Cited standard
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    Mounting security
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    Image colour
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    Supplied storage
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    EAN
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    Cited standard
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    Mounting security
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