Acebeam H40 SST20 600lm In-depth review, Pros and Cons

Luminus SST20 LED
600 lm output
4104 cd intensity
1 x 14500 Li-Ion or 1 x AA NiMH battery

The Acebeam H40 SST20 (H40SST20) released in 2019. It uses Luminus SST20 LED, OP reflector and 1 x 14500 Li-Ion or 1 x AA NiMH battery. The powerful emitter in this headlamp provides up to 600 lm output, 4104 cd intensity, and a beam distance of 128 m.

The H40 SST20 is particularly useful in situations where you need to use both hands, such as camping, hiking, or working in low-light environments. This light has 3 modes of lighting. The mode memory of H40 SST20 eliminates the need to cycle through different modes every time you turn on the flashlight, providing convenience and saving time.

Acebeam H40 SST20 (H40SST20) pictures

Acebeam H40 SST20 / H40SST20 photo
Acebeam H40 SST20 / H40SST20 photo
Acebeam H40 SST20 / H40SST20 photo
Acebeam H40 SST20 / H40SST20

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 Acebeam H40 SST20, then don’t hesite and signal the problem to us.

Acebeam H40 SST20 (H40SST20) specifications

NameH40 SST20
Rated 3/5 based on 1273 user votes.

Headlamps consist of a light source attached to a headband, allowing users to wear them hands-free.


Weight34 g
Length64.7 mm
Body diameter23.4 mm
Head diameter26.9 mm
Materialaluminium alloy with HAIII hard-anodized finish

The H40 SST20 is small, compact, and designed for ultra-portability. The length of the H40 SST20 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. The aluminium body of H40 SST20 has excellent thermal conductivity, meaning it can effectively dissipate heat generated by the flashlight's components, such as the LED or battery.

The body of H40 SST20 flashlight treated with a Type III hard-anodized, anti-abrasive finish. The H40 SST20 flashlight is offered in a stylish black color.


EmitterLuminus SST20 LED
Color temperature4000 K
Lenstoughtened AR coated glass
Switchelectronic side

Luminus has established a positive reputation as a reliable LED manufacturer, and their products are widely used and trusted by lighting professionals and enthusiasts alike. Warm white light is generally considered more comfortable and less harsh on the eyes compared to cool white light. The orange peel reflector of H40 SST20 is designed to improve the beam characteristics of the flashlight by diffusing the light emitted from the light source.

The AR coating reduces the loss of light due to reflections, allowing more light to pass through the lens. This can increase the overall brightness and efficiency of the H40 SST20 flashlight. The H40 SST20 has electronic switch. The electronic switches may have a higher likelihood of standby drain compared to mechanical switches since they require a small amount of power for operation.


Flux600 lm
Intensity4104 cd
Throw128 m
CD/LM factor6.84

600 lm can provide a decent amount of brightness and be suitable for many everyday tasks, it may not be sufficient for certain scenarios or individuals with specific requirements. With 4104 cd, the H40 SST20 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. If accurate color representation is a priority for your specific needs, a flashlight with a CRI of 90 or above is highly recommended. The H40 SST20 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.


Modes3 modes
Mode memoryyes
Ramping modeyes

Modes on a flashlight refer to different output settings or levels of brightness that can be selected to suit different needs and preferences. The H40 SST20 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 H40 SST20 has an SOS signal mode. The SOS code consists of three short signals, followed by three long signals, and then three short signals again.


Battery1 x 14500 Li-Ion or 1 x AA NiMH battery
Battery indicatorno
Charger portno
Thermal regulationno

The power source of the H40 SST20 flashlight is 1 x 14500 Li-Ion or 1 x AA NiMH battery, providing reliable and long-lasting energy for optimal performance. The H40 SST20 cannot charge batteries directly. You may need an external charger to keep your battery going. When the H40 SST20 flashlight detects that the voltage of the battery has dropped to a certain threshold, it automatically reduces or cuts off the power output to prevent further discharge. This helps to preserve the battery's capacity and prevent it from reaching a critically low voltage level.

Flashlights without thermal protection may be more susceptible to overheating under extreme conditions, such as prolonged high-output use or exposure to high ambient temperatures. The "6" in the IP68 rating represents the level of protection against solid objects, specifically dust and foreign particles. It indicates that the H40 SST20 flashlight, is fully protected against the entry of dust and other solid objects. The "8" in the IP68 rating indicates the highest level of protection against water ingress.


Package contents2 x spare o-rings

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 Acebeam H40 SST20 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.

Acebeam H40 SST20 (H40SST20) comparisons

According to our statistics, the Acebeam H40 SST20 flashlight was most often compared on our site with the following flashlights.

Acebeam TK18 CU Samsung (TK18CUS) Acebeam TK18 CU Samsung Acebeam X10 (X10) Acebeam X10 Acebeam X80 GT (X80GT) Acebeam X80 GT Acebeam X75 XHP70.2 (X75XHP702) Acebeam X75 XHP70.2 Acebeam D46 (D46) Acebeam D46 Acebeam L35 P70 (L35P70) Acebeam L35 P70 Acebeam TK18 AL Samsung (TK18ALS) Acebeam TK18 AL Samsung Acebeam D45 (D45) Acebeam D45

If there’s information about the Acebeam H40 SST20 that you would like to see on this site, then write to us.

FlashlightChart.com / Flashlights / Acebeam / Acebeam H40 SST20 (2019)