Weltool W35A, Weltool LH1

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Weltool W35A Review with LH1 head: Weapon mount flashlight

Weltool LH1 specifications

Brand/modelWeltool W35A
Lumens686 lm
Beam intensity89,600 cd
Battery config.1*18350
Review dateJune 2021


Weltool has a wide range of flashlights, but they are definitely focused on flashlights for professionals. Those include Infrared, UV, and lots of tactical and weapon-mount flashlights. The one for review is the Weltool W35A, a weapon mount flashlight with extremely high intensity for its size. The W35A is actually a combination of the W35 flashlight body, with the LH1 flashlight head. The W35A is available with a black or tan coating. The one I’m reviewing has a black coating.

The W35A is part of the new ‘Metal Lancer’ weapon lights Weltool is producing. Besides this ‘white light’ version, Weltool also sells an Infrared (2000mW, 850nm) version, named W35IR, to keep it simple. 35 is probably referring to the type of battery that is being used in this light, namely a 18350 (35mm) lithium-ion battery.

Oh, and because this is a flashlight you could have to depend your life on, it’s just a 1-mode flashlight. On and Off.

Package quality.

Since mine is a pre-mass production copy, it doesn’t include any accessories.

Flashlight in use

Being a weapon-mount flashlight, the W35A doesn’t have a lanyard attachment nor a holster. It has a weapon attachment that is used for various rail mount, including the Weltool PM4. Furthermore, the W35 series tactical lights can be installed on M-LOK or Picatinny, Keymod, MIL-STD-1913, STANAG 2324, STANAG 4694, Weaver and other types of tactical rails, according to their website.

It’s suitable for AR rifles and short-barrel rifles or carbines.

There’s only 1 switch, and that’s a real tactical forward clicky switch. Forward clicky switches are the best choice for tactical flashlight, because you don’t need to fully press the switch to have light. A half-press is enough to turn the flashlight on temporarily. This is called Momentary mode. You can do morse coding with it, in case you were interested.

Build Quality, and Warranty

Weltool doesn’t cut corners when it comes to build quality. All the Weltool flashlights I own, none of them had any build quality issues. The W35A looks good, feels good, and is machined very well.

The coating is matte, and there is no blemish to be found on any of the flashlights parts.

I can see why Weltool used its current design. The battery need to be inserted from the front (unscrew the head). The tailcap can be unscrewed, but you’ll be looking at a much narrower hole, through which the battery won’t fit. This is probably done on purpose to keep the battery in place during the gun’s recoil. The spring of the switch goes through this narrow hole, and keeps in touch with the battery at all times, without crushing the spring. This is also the case where the metal ring around the driver is protecting the battery from crushing the driver. Smart idea, and well executed.

I’m quite impressed by the attention of detail that is necessary to make this light the way it works. I love that, and that’s why you can count on Weltool as a company. They even reached out to me specifically to test this W35+LH1 combination for measurements.

Weltool’s warranty shouldn’t be a problem. Here are the details found on their website:

Weltool warrants its products to be free of defects for a lifetime of use. They will repair any light device which is found to be defective under normal use. From the date of sale (the serial number on the Lights body can determine the date), the limited warranty for LED products is 5 years, and the warranty for LEP products is 2 years.

If you have questions about the details, reach out to them.

LED, Lens, Bezel, and Reflector

Weltool calls the LED of the W35A: 1*white light X-LED. When you look through the coated front glass lens, you’ll notice an Osram LED. I’m not 100% sure which exact emitter it is, but it looks like a KW CSLNM1.TG. Correct me if I’m wrong.

The glass lens is coated, and protects the deep and smooth flashlight reflector. Deep down the ‘barrel’ you’ll see the LED nicely centered.

Its bezel is black, and could be removed with an anti-skid pad. I couldn’t open it by hand, so your mileage may vary.

The deep and smooth reflector make a very distinct hot spot and corona, with plenty of spill. Keep in mind that smooth reflectors make rings in the beam more visible, and the W35A has some visible rings at close distance as well. They will disappear at larger distance.

Dimensions and size comparison

  • Length: 118 mm / 4.64 ”
  • Head diameter:  36.2 mm /  1.28”


  • Empty: 96.3 g / 3.4 oz
  • With battery: 122.7 g / 4.33oz

Flashlight comparison

Size compared to 1 more weapon mount flashlight

Image 1, from left to right: Weltool W35A, Olight Odin Turbo

And another weltool family shot.

Image 2: Weltool W35A, Weltool M2-BF (UV Flashlight), Weltool W3 PRO, Weltool T11, Weltool W4

Driver & User Interface:

What driver? I’m glad you asked. This is by far the most simple UI you will ever find. Click for on, and another click for off. That’s it. No special modes, no nothing. Just 1 mode.

And since it has a forward clicky switch, you’ll have the momentary On feature.

Available modes:

  • 1-mode

From OFF:

  • Half-press: Momentary On
  • Single-click:  (to last used mode, mode memory)

From ON:

  • Single-click: Off

Blinky modes menu:

  • No

Low battery warning:

  • No, it just ramps down, so you have enough time to replace the battery

Lock-out mode:

  • No, unneccessary for a flashlight with a mechanical forward-clicky switch.


  • Not visible

Batteries & Charging

The W35A accepts 18350 batteries, both button tops and flat tops. It also accepts unprotected, as well as protected batteries.

Weltool was kind enough to send a 18350 battery along with the light. It’s coded as: Weltool UB18-12P, a Micro-USB rechargeable 18350 battery with 1200mAh.


Lumen measurements:

All output numbers are relative for my home-made Integrating Sphere. It is set up with an Extech SDL400 Lux Meter for measurements including a Kenko PRO1D ND-16 filter. The base measurement is done with a Convoy S2+ that has been tested at 255 lumens.

All of my readings were taken from a fully-charged Weltool UB18-12P, 1200mAh.

Amps were measured with a Fluke 77III, at the tailcap.


On (1-mode)686 lumens340 lumens579 lumens598 lumens


The runtime test was done with the 50cm integrating sphere, including the Kenko Pro1D ND-16 filter and Extech SDL400 data logging Lux Meter.

It starts at almost 600 lumens and does that for about 3 minutes when it starts ramping down rapidly, and end up around 340 lumens. It starts to slowly increase in output until it nears 350 lumens at 32 minutes. It then starts dropping till 48 minutes. At this point, the output is down to 77 lumens, and then abruptly turns off.

Throw Measurement

Measurements were taken both indoors and outdoors with a professional Hagner E4-X Lux Meter. The numbers below are from the 20 meters outdoor test (at 30 seconds)

BrandSpecsMeasured CandelaMetersyards
Weltool W35A (LH1)89,600 cd82,800 cd575629.37

This is the same runtime graph, but then calculated with beam intensity


For the following beamshots I used a Canon EOS 5D Mk2 and a 50mm lens. manual settings: ISO1600, 1/4sec , F4, 5000K

The shed is about 65 meters / 71 yards away. 

Disclaimer: This flashlight was sent to me for review at no cost by Weltool. I have not been paid to review, nor have I been holding back on problems or defects.

Final Verdict


  1. Simple UI
  2. Nice, well thought out design
  3. No PWM


  1. none

Explanation on star ratings:

1: Avoid: my phone flashlight would be a better choice – 2: Poor: significant defect or issues, much better options available at the same price – 3: Average: some defects or issues – 4: Good: recommended (minor issues) – 5: Great: highly recommended

Author: Marco

5 stars: ★★★★★

I must admit, I don’t have a gun. So, just like all my other flashlight reviews, I focus on its performance in terms of output, runtime, throw etc. Taking these things into consideration, and the extremely simple UI. Click for on, and click for off.

Weltool W35A for sale:

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