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Red torches

UltraFire 501R red LED torch

A red LED torch publishing both its wavelength band and its dimming range, with an adjustable zoom head and an IPX4 aluminium body.

UltraFire 501R red LED torch with zoom head

UltraFire 501R red LED torch

A red LED torch publishing both its wavelength band and its dimming range, with an adjustable zoom head and an IPX4 aluminium body.

Red output type
620–630 nm, as the maker publishes it · The listing gives none
Dimming range
Stepless from 5 % to 100 %, as the maker publishes it
Minimum
Not published by the maker.
Mode memory
Not published by the maker.
Battery type
Not published by the maker.
Cold behaviour
IPX4
Weight
Not published by the maker.
Attachment
Not published by the maker.
Amazon reference
B08NYJ3J1M (same reference on 5 Amazon marketplaces)
EAN
0723803051634
  • Publishes both the wavelength band and the dimming range, which almost nothing here does
  • Five per cent as a stated minimum is a real figure rather than a vague “dimmable”
  • No absolute output figure, so 5 % cannot be converted to lumens

Best for: An observer who wants a red torch whose low setting is specified rather than promised

≈ £36 / €40
Check price on Amazon

Specifications

Red output type
620–630 nm, as the maker publishes it · The listing gives none
Dimming range
Stepless from 5 % to 100 %, as the maker publishes it
Minimum
Not published by the maker.
Mode memory
Not published by the maker.
Battery type
Not published by the maker.
Cold behaviour
IPX4
Weight
Not published by the maker.
Attachment
Not published by the maker.
Amazon reference
B08NYJ3J1M (same reference on 5 Amazon marketplaces)
EAN
0723803051634

Two published figures, and they are the right two

Six hundred and twenty to six hundred and thirty nanometres, and stepless dimming from five to a hundred per cent. Wavelength decides how much dark adaptation the light costs; the dimming range decides whether it can be turned down far enough to matter.

The half that is missing

An absolute output. Five per cent of what? Without a lumen figure the minimum cannot be compared with another torch, and a low percentage of a very bright lamp is not a low light.

The zoom

The head slides to spread or narrow the beam, and the maker claims 200 metres at the narrow end. For reading a chart, the wide setting is the useful one; the throw is a feature for a different market.

Where it is sold

Hunting, night observation, fishing, and astronomy — the maker lists all four. That explains the reach at the top end, and it explains why the dimming range is the specification an astronomer should read first.

Availability

German, French, Italian and Spanish Amazon stores ran from 40 € to 47 € 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

More red torches

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    DaskFire 4-in-1 LED torch

    A four-colour LED torch with a zoom head and a stated 900 lumens, whose red mode is one of four rather than its purpose.

    Red output type
    White, blue, green and red · 900 lumens, as the maker states it — for the white mode · The listing gives none · The listing gives none for any colour
    Dimming range
    Not described
    Minimum
    Not published by the maker.
    Mode memory
    Not published by the maker.
    Battery type
    Not published by the maker.
    Cold behaviour
    Not published by the maker.
    Weight
    Not published by the maker.
    Attachment
    Not published by the maker.
    Amazon reference
    B0822G4LZG (same reference on 5 Amazon marketplaces)
    EAN
    0746362765729
    • Four colours in one torch, which covers several uses in a bag
    • Zoom focus, so the beam spreads for a chart or narrows for a distance
    • No dimming is described, and a fixed red level is the wrong tool for a chart

    Best for: A general outdoor torch whose red mode will do at a pinch

    ≈ £17 / €20
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  • Explore Scientific Astro R-Lite red torch with belt clip

    Explore Scientific Astro R-Lite (0340100)

    A black anodised red torch with an adjustable dimmer, bright and dim continuous modes, a flashing mode and a 360-degree side signal, published at 105 g.

    Red output type
    Not published by the maker.
    Dimming range
    Continuously adjustable by a dial, per the maker
    Minimum
    Not published by the maker.
    Mode memory
    Continuous bright, continuous dim, and flashing · 360 degrees, through side cutouts
    Battery type
    One AA (LR6), supplied
    Cold behaviour
    Up to 100 hours, as the maker publishes it
    Weight
    92 × 25 × 25 mm, as the maker publishes them · 105 g, as the maker publishes it
    Attachment
    Torch, wrist strap, belt clip, battery
    Amazon reference
    B07CZ2TP7X (same reference on 6 Amazon marketplaces)
    EAN
    4007922039534
    • A continuous dimmer, which is the specification that matters most for astronomy
    • Runtime, dimensions, weight and battery type all published
    • No wavelength figure for the red LED

    Best for: Reading a chart at the eyepiece without losing dark adaptation

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    Check price on Amazon
  • 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
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    EAN
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    • 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
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The rest of this rack

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    Celestron 1.25 in star diagonal (94115-A)

    A 90-degree mirror diagonal for 1.25 in focusers, giving an image that is the right way up and reversed left to right.

    Mirror or prism construction
    90-degree mirror star diagonal
    Reflectivity
    The listing does not carry it
    Barrel size
    1.25 in focuser and visual back
    Clamping method
    Standard 1.25 in eyepieces, Barlow lenses and accessories
    Optical path length
    Upright, with left and right reversed, as the maker states it
    Build
    Not published by the maker.
    Amazon reference
    B00009X3UO (same reference on 6 Amazon marketplaces)
    EAN
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    • The maker states the image orientation precisely instead of calling it “correct image”
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    ≈ $42 / €47
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  • Seben AP3 90 degree 1.25 inch star diagonal

    Seben AP3 90° star diagonal 1.25 in

    A 90-degree star diagonal with a 1.25 in fitting at both ends, explicitly excluded by the maker from use on Newtonian telescopes.

    Mirror or prism construction
    90-degree star diagonal · Not described — neither mirror nor prism is specified
    Reflectivity
    The listing does not carry it
    Barrel size
    31.7 mm (1.25 in) on both sides
    Clamping method
    Not published by the maker.
    Optical path length
    Not published by the maker.
    Build
    Refractors, Schmidt-Cassegrains and Maksutovs, as the maker lists them · Newtonian telescopes, stated outright by the maker
    Amazon reference
    B07NPC3SBN (same reference on 5 Amazon marketplaces)
    EAN
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    • The maker names both what it suits and what it does not, which is rare and useful
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    A projection adapter that takes a 1.25 in eyepiece up to 35 mm in diameter and couples it to a camera through a T2 ring bought separately.

    Camera mount
    T2 — a separate T2 ring for the specific camera is required, as the maker states
    T2 thread
    Not published by the maker.
    Flange distance
    31.7 mm (1.25 in) · 35 mm, as the maker publishes it
    Prime focus or projection design
    Eyepiece-projection adapter — the eyepiece stays in the light path
    Blackening
    Not published by the maker.
    Material
    Not published by the maker.
    Amazon reference
    B001BBE3XW (same reference on 6 Amazon marketplaces)
    EAN
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    • The maker states that a separate T2 ring is required rather than implying it is included
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All red torches