Astrolux S43 LH351D 4000lm review. Is it worth it in 2023?

2018

4 x Samsung LH351D LEDs

4000 lm output

8464 cd intensity

1 x 18650 Li-Ion battery

The Astrolux S43 LH351D (S43LH351D) released in 2018. It uses 4 x Samsung LH351D LEDs, TIR reflector and 1 x 18650 Li-Ion battery. The powerful emitter in this flashlight provides up to 4000 lm output, 8464 cd intensity, and a beam distance of 184 m.

The S43 LH351D is a powerful and reliable flashlight. With its impressive illumination capabilities and durable construction, it serves as an exceptional lighting tool for various situations and environments. TIR lens plays a significant role in shaping the beam pattern of the S43 LH351D flashlight. The mode memory of S43 LH351D contributes to a more seamless and intuitive user experience. It has a strobe function, which is one of the most effective self defense tools available. This USB rechargeable flashlight has become a popular choice for both everyday use and demanding situations where reliable lighting is essential.

Table of contents:

Astrolux S43 LH351D specifications
Astrolux S43 LH351D pictures
Astrolux S43 LH351D comparisons

Astrolux S43 LH351D (S43LH351D) specifications

Brand	Astrolux
Name	S43 LH351D
Type	S43LH351D
Rating	★★★★★ Rated 4/5 based on 1100 user votes.
Launch	2018
Form	flashlight

Flashlights enable you to navigate in the dark, locate supplies, signal for help, or provide comfort and security in challenging circumstances.

Body

Weight	60 g
Length	88.7 mm
Head diameter	27 mm
Material	aluminium alloy body with HAIII hard-anodized finish
Colors	black

The 60 g flashlight would be considered extremely lightweight for a handheld flashlight. The length of the S43 LH351D flashlight can affect its portability. A shorter flashlight is generally easier to carry in a pocket, bag, or pouch, making it more convenient for everyday use or when you're on the go. Aluminium is a lightweight material, which is beneficial for S43 LH351D flashlight. The body of S43 LH351D flashlight treated with a Type III hard-anodized, anti-abrasive ﬁnish. This flashlight comes in a sleek black color option.

System

Emitter	4 x Samsung LH351D LEDs
Color temperature	5000 K
Reflector	TIR
Lens	TIR
Switch	electronic side

The emitter of S43 LH351D manufactured by Samsung, a Korean LED manufacturer. Color temperature is a characteristic of light. It is measured in units called Kelvin (K) and is used to quantify the color appearance of light sources, particularly white light. The TIR lens of S43 LH351D consists of a single-piece lens made of a transparent material, typically acrylic or polycarbonate. Its shape and internal geometry are designed to achieve specific light distribution patterns, such as flood or spot beams, by manipulating the behavior of light rays. The S43 LH351D utilizes electronic switch. Electronic switches on flashlights provide a range of advantages and additional features compared to mechanical switches.

Performance

Flux	4000 lm
Intensity	8464 cd
Throw	184 m
CD/LM factor	2.12
CRI	95

With 4000 lm, the S43 LH351D flashlight will provide an exceptionally bright and powerful beam of light. It can illuminate large areas, outdoor spaces, or even act as a temporary spotlight in certain situations. With 8464 cd, the S43 LH351D flashlight provides a noticeably brighter and more intense beam of light. It can illuminate objects or areas with greater clarity and visibility, even at longer distances.

The throw distance refers to the maximum distance at which the flashlight can effectively illuminate an object or target. The stated throw distance typically indicates the point at which the brightness falls below a specified threshold, such as 0.25 lux. The candela per lumen (cd/lm) ratio can be used to determine if a flashlight has a spot or flood type beam. Well-focused spot beams can be over 100 cd/lm, tactical flashlights are typically between 20-100 cd/lm, and work lights are less than 10 cd/lm.

A flashlight with a higher CRI can provide better color accuracy when examining objects or distinguishing between different colors in low-light or nighttime situations. This can be beneficial in certain tasks or activities where color discrimination is important, such as identifying wires or reading color-coded information. With a CRI of 95, the S43 LH351D flashlight can render colors with exceptional fidelity, capturing even subtle nuances and details in color. This makes it particularly well-suited for applications where precise color discrimination and accurate color reproduction are critical.

Software

Firmware	NarsilM
Mode memory	yes
Ramping mode	yes
Strobe	yes
SOS/Beacon	yes

NarsilM is an open-source firmware designed for flashlights, it is similar to Anduril. The S43 LH351D has mode memory. Mode memory means that the flashlight will remember the mode you were using when the light was last turned off, and when you turn it on again. The S43 LH351D flashlight with ramping mode has a user interface that enables you to control the brightness level by pressing and holding a button.

The S43 LH351D is tactical strobe ready. The strobe light is disorienting to the person it is aimed at which makes it difficult for them to concentrate. It has the SOS beacon function for an emergency situation. The SOS flashes Morse code so you can signal for help when needed. The SOS signal is recognized as an international distress call and is used to indicate an urgent need for assistance.

Features

Battery	1 x 18650 Li-Ion battery
Battery indicator	yes
Charger port	microUSB
LVP	yes
Thermal regulation	yes
Protection	IPx6
AUX LEDs	no
Magnetic	no

The Astrolux S43 LH351D flashlight is powered by 1 x 18650 Li-Ion battery. The battery indicator lets you know when the battery is low, charging, or fully charged. The S43 LH351D flashlight can be charged directly from a USB power source, such as a wall adapter, computer, power bank, or car charger. This allows for convenient and versatile charging options, as you can utilize various USB power sources to recharge the flashlight's internal battery.

This flashlight has a built-in low voltage protection (LVP) to prevent damage to the cell from over-discharge, so protected cells are not necessary. The S43 LH351D has thermal protection feature. The thermal protection mechanisms are designed to monitor and regulate the temperature of the flashlight during operation. This feature helps prevent overheating, which can be detrimental to the flashlight's performance, battery, and overall safety. The IPx6 rating indicates that the S43 LH351D flashlight has a protection against water jets.

Accessories

Package contents	18350 tube clip lanyard spare o-ring survival hammer

The clip is useful to keep the light secured in your pocket. The lanyard prevents accidental loss of the flashlight. Regularly replacing worn or damaged O-rings helps maintain the overall durability and performance of the flashlight.

The performance of the Astrolux S43 LH351D flashlight is measured according to the ANSI / NEMA FL1 Standard 30 seconds after switching the light on. The ANSI/NEMA FL1 2009 Standard is a set of flashlight performance guidelines.

The specifications above are based on the official data published by the manufacturer, but we also take user reviews into consideration. If you found an error or something lacking in the specifications above for the Astrolux S43 LH351D, then don’t hesite and signal the problem to us.