Astrolux S43S LH351D 4000lm In-depth review, Pros and Cons

4 x Samsung LH351D LEDs

4000 lm output

8464 cd intensity

1 x 18650 Li-Ion battery

The Astrolux S43S LH351D (S43SLH351D) released in 2020. 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.

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The S43S LH351D flashlight provides instant illumination at the touch of a switch. This immediate response is particularly useful in emergency situations or when you need instant visibility. TIR technology minimizes hotspots, dark spots, and irregularities in the beam of S43S LH351D. 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 USB rechargeable flashlight eliminates the need for disposable batteries, offering a more eco-friendly and cost-effective solution.

Astrolux S43S LH351D (S43SLH351D) pictures

The specifications below 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 S43S LH351D, then don’t hesite and signal the problem to us.

Astrolux S43S LH351D (S43SLH351D) specifications

Brand	Astrolux
Name	S43S LH351D
Type	S43SLH351D
Rating	★★★★★ Rated 3/5 based on 1227 user votes.
Launch	2020
Form	flashlight

The S43S LH351D flashlight offers precise and focused illumination. Unlike ambient or overhead lighting sources, flashlights allow you to direct the light exactly where you need it.

Body

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

The S43S LH351D 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. A longer flashlight may provide a more substantial grip, making it easier to hold and control, especially if you have larger hands. The aluminium body of S43S LH351D has excellent thermal conductivity, meaning it can effectively dissipate heat generated by the flashlight's components, such as the LED or battery.

The HAIII coating can also enhance the visual appearance of the flashlight. It offers a uniform and attractive finish, often available in different colors, giving the flashlight a sleek and professional look. The S43S LH351D flashlight is offered in a stylish black color.

System

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

Samsung has invested significant resources into research and development, resulting in innovative LED technologies and advancements. Their LED products are known for their efficiency, durability, and excellent performance. 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 S43S LH351D can minimize light loss and achieve high light output by capturing and redirecting a significant portion of the emitted light. This can result in improved overall beam quality, better beam control, and reduced stray light. The S43S 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 S43S 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 S43S 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 is the calculated distance in meters at which the flashlight produces a light intensity of 0.25 lux. Candela per lumen (cd/lm) is a measure of a flashlight's beam intensity relative to its total luminous flux or output. It quantifies the concentration of light emitted by the flashlight in relation to the total amount of light produced. 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. The S43S LH351D flashlight with a CRI of 95 offers the most accurate and true-to-life color representation, allowing you to perceive colors as they were intended to be seen.

Software

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

NarsilM has a user-friendly interface that allows for intuitive operation and navigation through different modes and settings. It often incorporates a combination of button presses or sequences to access various features. The S43S 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 advantage of the ramping mode is that it offers precise control over the amount of light emitted by the flashlight.

The S43S 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 S43S 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 USB charger port on a flashlight can be particularly useful in emergency situations where access to power outlets may be limited. 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 built-in thermal control automatically adjusts brightness output to prevent overheating. The IPx6 rating indicates that the S43S LH351D flashlight has a protection against water jets.

Accessories

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

With a clip, you can securely fasten the flashlight to a reachable location, ensuring it is easily accessible whenever you need it. By securing the flashlight with a lanyard, you can free up your hands for other tasks while keeping the flashlight within reach. Instead of searching for compatible O-rings or waiting for replacements to arrive, having spare O-rings readily available allows for convenient and immediate repairs or replacements.

The performance of the Astrolux S43S 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.