Astrolux S1 flashlight review

1600 lm output
8500 cd intensity
1 x 18350 Li-Ion battery

The Astrolux S1 flashlight released in 2017. It uses Cree XP-L LED, OP reflector and 1 x 18350 Li-Ion battery. The powerful emitter in this flashlight provides up to 1600 lm output, 8500 cd intensity, and a beam distance of 184 m.

Curious to see if this flashlight impresses? Read on!

Table of Contents

The content of this article reflects our own experiences and viewpoints. We aim to offer insights on a topic, and we hope others find it helpful and motivating. Additionally, we make every effort to provide accurate and comprehensive coverage. If you found an error or something lacking in the specifications for the Astrolux S1, then tell us.

Astrolux S1 / S1

The S1 flashlight offers a versatile lighting solution. This light has 4/7 modes of lighting. The memory function is a nice feature, the light will remember the last used mode. It has a strobe function, which is one of the most effective self defense tools available.

Astrolux S1 specifications

Rated 4 / 5 based on 1441 user votes.

This flashlight can fit in pockets, backpacks, or glove compartments. You can carry it wherever you go.

Astrolux S1 / 2

Body, materials, weight, colors

Weight80 g
Length80 mm
Head diameter24 mm
Materialaluminium alloy with HAIII hard-anodized finish

The flashlight weighs 80 g. It is lightweight and easy to handle for most people. Consider the length of the flashlight. It should fit comfortably in your chosen way to carry it. The aluminium body of the S1 has a reputation for being durable and strong. It offers excellent resistance to impacts, scratches, and corrosion. The HAIII coating resists corrosion well. It shields the aluminum from moisture, humidity, and other corrosive elements. The S1 flashlight is available in assorted colors: black, blue, red.

Astrolux S1 / 1

System, LED, lens, reflector

EmitterCree XP-L LED
Color temperature4000 K, 5000 K, 6500 K
Lenstoughtened AR coated glass
Switchmechanical rear

Cree is a US-based LED manufacturer. It is well-regarded for its high-quality products and innovation in lighting. Color temperature is a characteristic of light. It is used to quantify the color appearance of light sources. The S1 has an orange peel (OP) textured reflector. Orange peel reflectors have smoother beams. The coating is thin and applied to the lens surface. It cuts reflections and boosts light transmission.

Mechanical switches are usually robust. They resist wear and tear and work in many environments. The S1 flashlight has a rear switch. Its operation is usually simple and easy to understand.

Astrolux S1 / 4

Performance, flux, intensity, throw

Flux1600 lm
Intensity8500 cd
Throw184 m
CD/LM factor5.31

With 1600 lm, the S1 flashlight will offer a brighter and more powerful beam of light. The S1 flashlight has 8500 cd. It provides a much brighter and more intense beam. The throw is the distance in meters at which the flashlight produces a light intensity of 0.25 lux. The cd/lm factor is the candela-to-lumen ratio. It shows how concentrated a light source's output is.

Astrolux S1 / 3

Software, user interface, modes

FirmwareBLF A6
Modes4/7 modes
Mode memoryyes
Ramping modeno

A flashlight's modes are different output settings or brightness levels. They can be chosen to meet different needs and preferences. The flashlight has mode memory. It remembers the mode you were using when the light was last turned off. It stays in that mode when you turn it on again. Strobe mode on S1 flashlight produces a rapid, repeated flashing of light.

Astrolux S1 / 5

Features, battery, protections

Battery1 x 18350 Li-Ion battery
Battery indicatorno
Charger portno
Thermal regulationno

The Astrolux S1 flashlight is powered by 1 x 18350 Li-Ion battery. The S1 cannot charge batteries. You may need an external charger to keep your battery going. This flashlight has built-in low voltage protection (LVP). It prevents damage from over-discharge, so it doesn't need protected cells. This light does not have temperature control feature. The "8" in the IPx8 rating means the highest level of protection. It is against water ingress.

Accessories, package contents

Package contents2 x spare o-rings
spare rubber cover

The clip is useful to keep the light secured in your pocket. Attaching a lanyard to your S1 flashlight provides an additional layer of security. It reduces the risk of accidental drops or loss. Replacing worn or damaged O-rings helps a lot. It keeps up the flashlight's durability and performance.

According to the ANSI/NEMA FL1 Standard, we measure the performance of the S1 flashlight 30 seconds after switching on the light. The ANSI/NEMA FL1 2009 Standard is a set of flashlight performance guidelines.

Conclusion, pros and cons

This Astrolux flashlight, like any other, has its strengths and weaknesses. Let's take a close look at both sides to understand this flashlight better. I share my thoughts on its standout features and the parts that might need improvement. Keep in mind, these are just my opinions, and you might have a different perspective.


  • lightweight
  • aluminium body
  • body color options
  • warm light
  • OP reflector
  • AR coated lens
  • tactical switch
  • adequate performance
  • multiple modes
  • mode memory
  • tactical strobe
  • low-voltage protection
  • waterproof
  • clip


  • no battery indicator
  • no built-in charger
  • no thermal regulation
  • no auxiliary LEDs
  • non-magnetic


Astrolux S1 / S1 photo 1.
Astrolux S1 / S1 photo 2.
Astrolux S1 / S1 photo 3.
Astrolux S1 / S1 photo 4.
Astrolux S1 / S1 photo 5.
Astrolux S1 / S1 photo 6.
Astrolux S1 / S1

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David Hagon
I love bushcraft and flashlights. I find joy in mastering wilderness survival skills and exploring the realm of illuminating gadgets. Bushcraft isn't just fun, it's a learning journey. I form a strong bond with nature. It's more than a hobby, it enriches me in practical and spiritual ways.
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