Astrolux S43 XP-L flashlight review

4 x Cree XP-L HI LEDs
4600 lm output
8464 cd intensity
1 x 18650 Li-Ion battery

The Astrolux S43 XP-L flashlight was released in 2018. It uses 4 x Cree XP-L HI LEDs, TIR reflector and 1 x 18650 Li-Ion battery. The powerful emitter in this flashlight provides up to 4600 lm output, 8464 cd intensity, and a beam distance of 184 m.

Excited to learn if the S43 XP-L lives up to expectations? Read on!

Table of Contents

  • Astrolux S43 XP-L specifications
    • Body, materials, weight, colors
    • System, LED, lens, reflector
    • Performance, flux, intensity, throw
    • Software, user interface, modes
    • Features, battery, protections
    • Accessories, package contents
  • Conclusion, pros and cons
  • Photos
  • Comparisons

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 S43 XP-L, then tell us.

Astrolux S43 XP-L / S43XPL

The S43 XP-L flashlight offers a versatile lighting solution. TIR technology minimizes hotspots, dark spots, and irregularities in the beam of S43 XP-L. 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. This Astrolux USB rechargeable flashlight comes with versatile charging options.

Astrolux S43 XP-L specifications

NameS43 XP-L
Rated 4 / 5 based on 1469 user votes.

The S43 XP-L flashlight allows you to light dark areas. It helps you find hazards or stop threats by shining light on them.

Astrolux S43 XP-L / 4

Body, materials, weight, colors

Weight60 g
Length88.7 mm
Head diameter27 mm
Materialaluminium alloy body with HAIII hard-anodized finish

The S43 XP-L is small, compact, and designed for ultra-portability. The length of a flashlight can affect how it feels in your hand and how you can grip and maneuver it. The aluminium body of the S43 XP-L has excellent thermal conductivity. This means it can effectively dissipate heat generated by the flashlight's components. The HAIII coating resists corrosion well. It shields the aluminum from moisture, humidity, and other corrosive elements. The S43 XP-L flashlight comes in a stylish black color.

Astrolux S43 XP-L / 6

System, LED, lens, reflector

Emitter4 x Cree XP-L HI LEDs
Color temperature5000 K, 6500 K
Switchelectronic side

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 TIR lens of the S43 XP-L can reduce light loss. To achieve high light output, it captures and redirects much of the emitted light. The flashlight has electronic switches. They have many benefits and extra features compared to mechanical switches.

Astrolux S43 XP-L / 3

Performance, flux, intensity, throw

Flux4600 lm
Intensity8464 cd
Throw184 m
CD/LM factor1.84

The S43 XP-L flashlight has 4600 lm. It will provide an exceptionally bright and powerful beam of light. The S43 XP-L flashlight has 8464 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 S43 XP-L / 2

Software, user interface, modes

Mode memoryyes
Ramping modeyes

NarsilM has a user-friendly interface. It allows for intuitive operation and navigation through modes and settings. 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. The ramping mode has an advantage. It offers precise control over the light amount emitted by the flashlight. You can use Strobe for signaling purposes. It can also be used for self-defense or to attract attention in emergency situations. The S43 XP-L's SOS mode produces a specific sequence of long and short flashes. It signals distress or emergency.

Astrolux S43 XP-L / 1

Features, battery, protections

Battery1 x 18650 Li-Ion battery
Battery indicatoryes
Charger portmicroUSB
Thermal regulationyes

The Astrolux S43 XP-L flashlight is powered by 1 x 18650 Li-Ion battery. The battery indicator helps users check the battery status. It also estimates how much runtime they have left before recharging the battery. The built-in charger allows for convenient and versatile charging. You can use various USB power sources to recharge the battery. The flashlight detects when the battery's voltage has dropped to a certain level. Then, it reduces or cuts off the power.

The built-in thermal control adjusts brightness output to prevent overheating. The IPx6 rating indicates that the flashlight has a protection against water jets.

Astrolux S43 XP-L / 5

Accessories, package contents

Package contents18350 tube
spare o-ring
survival hammer

The clip is useful to keep the light secured in your pocket. Securing the flashlight with a lanyard frees up your hands for other tasks. It keeps the flashlight within reach. 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 S43 XP-L 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
  • warm light
  • TIR lens
  • side switch
  • strong flux
  • NarsilM firmware
  • mode memory
  • ramping mode
  • tactical strobe
  • SOS/beacon function
  • battery indicator
  • USB charger
  • low-voltage protection
  • thermal regulation
  • waterproof
  • clip


  • no auxiliary LEDs
  • non-magnetic


Astrolux S43 XP-L / S43XPL photo 1.
Astrolux S43 XP-L / S43XPL photo 2.
Astrolux S43 XP-L / S43XPL photo 3.
Astrolux S43 XP-L / S43XPL photo 4.
Astrolux S43 XP-L / S43XPL photo 5.
Astrolux S43 XP-L / S43XPL photo 6.
Astrolux S43 XP-L / S43XPL photo 7.
Astrolux S43 XP-L / S43XPL photo 8.
Astrolux S43 XP-L / S43XPL

Astrolux S43 XP-L comparisons

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Updated: April 23, 2024

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.