Klarus GL4 Rail-Mounted Light – 3300 Lumens, USB-C

If you’re looking for one of the best tactical weapon lights for under $130 USD, the Klarus GL4 has got to be on your list of consideration. This is a very well made, super bright, darkness slayer, that will guide you to your target during the night like its daytime.

What I like:
I. This light is extremely bright for its size or any size for that matter. It comes with a 5000mAh rechargeable lithium battery, aluminum construction, tactical features, great size that fits in my hand so nicely, remote mounted buttons, and rail mounting tactical clip.

II. This really is a top of the line flashlight, the build quality, materials used, features and functionality are all 5 star and I can’t imagine anyone saying otherwise.

Things to think about:
I. The biggest negative to me is the price. For me, you have to really perform if you’re going to be asking $129.99 USD for a gun light, and even then, it’s debatable. Now this flashlight definitely performs and I’m sure many people would argue that its worth that much all day long, but it’s debatable for me.

II. It helps that it comes with the remote tactical buttons that mount to the railing system and the integrated rail mount on the light itself. But, you can get a very comparable light on Amazon for half the price. It might not be as bright, but it will definitely be bright enough to serve it purpose effectively.

III. I don’t like that the rail mount on the flashlight itself isn’t completely removable, you will always have a piece sticking up where you hold the light with a non-tactical grip.

Overall, this is a really well built flashlight that definitely deserves your consideration. It’s extremely bright, comes with a huge rechargeable lithium battery, and is constructed super solid. If you’re ok with the price, they decide to lower it, or you can catch it on sale, this would be a fantastic light worth owning that will give you years of very happy, dependable great service as your go-to gun light.

You can trust that my reviews are always my honest opinion attempting to provide you with helpful insight that I wish I had, before I chose this product.

I am impressed with this weaponlight as it appears nearly as good as my higher end versions that cost several times as much, excepting for a few nitpicks.

I mounted this on the Pic rail of my rifle, and it has been very secure with easy access. For simplicity, I will list the pros and cons below:

- Compact at 5.5 inches long with a 1-1/8-inch diameter across the crenulated bezel.

- Weighs only 7.9 ounces with the Picatinny Mount and the battery installed.

- Is very bright with a decent spread and focused center beam.

- Easy to use tactile push buttons on the pressure pad which comes with a removeable Pic mount.

- The Tail Cap is relatively straightforward to use but has more than one button. The main push-button is the on/off switch. The three-dot angled button on the edge of the cap is the button that functions for changing the illumination settings (I would have preferred just to be able to cycle through the settings with the main button).

- I’m glad it has a strobe setting, as it is useful for disorienting an attacker.

- Uses a removeable rechargeable 5000mAh Li-Ion battery and can be charged within the light via a USB-C cable. There is an illuminated charging light: Red it’s charging, green indicates charging is complete.

- Uses the more durable and easier to use USB-C charging connection.

- Waterproof IPX8 rating and shock resistant. Seems to hold-up to recoil just fine.

- Will stay illuminated for up to approximately 4-hours on Turbo, 7-hours on high, 13.5-hours on medium, and 375-hours on low.

- Has a battery status indicator light that illuminates 5-seconds after the light is turned on: Less than 30% battery remaining and it’s red, 30% to 70% and its orange, over 70% power remaining and it’s green.

Cons (for which I am deducting one star):

- Protrudes off the rail a bit more than other weaponlights that I have.

- Is only made for Picitinny mounting. The way it was designed and for the current price, it should have an included M-LOK mount.

- This has a purported light output of 3300 lumens, and it is crazy bright in turbo mode, but when compared to other similar lights that I have that have somewhat lower lumens ratings, it really isn’t that much brighter. I’d say it’s more than likely closer 2000-2500 Lumens in turbo.

- Takes just over 4-hours to charge it up from empty.

- The cord for my pressure switch was kind of kinked in several places because of the way it was packaged in the box, and I couldn’t get it straight again.

- The pressure switch only works for on and off, and for pulse, and only in Turbo Mode; you can’t move through the different illumination settings with the pressure pad, which is a bummer as I have that option with some of my other weaponlights.

Despite the cons, it is a decent weaponlight that isn’t too large or cumbersome and which will apparently hold-up to abuse. To make sure I am adhering to Amazon’s Community Posting Guidelines so that this review does not get flagged, I do not have any pictures of it mounted on my rifle.

Bright and nice light for sure but was disappointed to find the strobe mode doesn't work with the remote thumb switch only with the normal button on the back of the light. So if you are planning on wanting strobe function with the remote hand switch then just get the streamlight brand

I'm surprised I haven't burned a hole through my wall with this yet. I have zero complaints about brightness. It's like the light of god shining down from on high, BUT...It gets hot, very hot. In short bursts like you'd be likely to use this in I think it's good to go. I would not recommend running it for extended periods like you would using it as a flashlight on the trail. I don't think it'll stand up to the heat as it doesn't really seem to dissipate anywhere except into the housing for the light.

main swich and mode swich，It's not working

There are lots of existing lengthy descriptive reviews already, so I’m going to only add a couple specifics

Mine is mounted on a 12 gauge Mossberg 590. Lots of things that work fine on a .223 rifle don’t survive shotgun use—for the limited shells I’ve fired, mostly rifled slugs, this light is unfazed. For home defense it should be durable enough, but that’s pretty soft duty.

More important to me is that given the long periods of disuse, are the ergonomics sufficiently intuitive and simple, that I’ll be able to readily implement them in times of stress. The fact that the pressure switch is basically only an one off switch is a big plus’s for me. I don’t want it to contain extra control options to divert my attention when it needs to be focused elsewhere.

Overall, my experience is consistent with the positive reviews. If it begins to diverge, I’ll add more to this review

I absolutely love this Klarus tactical light. The mounting system is one that I have never seen but it's great! It attaches and detaches from the pressure switch in an instant and it is rechargeable via a USB cable. This is my new favorite tactical light. I highly, highly recommend it!

The mounting slot can be sticky at times but you get used to it. The remote switch on the rifle works fine but you lose the ability to adjust the intensity of the light so take that as a grain of salt.
The remote switch mount provided works fine but I didn’t like the plastickiness of it so I bought a metal one and cut the ears (two rectangular loops) off to fit into the slot.

I have several outdoor tool lights, and this is my favorite out of all of them. It's brightness, size, weight, look, features, and functionality win the race in all categories. I Dig It 👍

The build quality of the Klarus GL4 is also top-notch. It feels solid and well-made in your hand, and the tactical switch is easy to operate even when wearing gloves. And if you need to use it in a tactical situation, you'll be pleased to know that it's designed to withstand heavy use and is built to last.

Overall, I'm incredibly impressed with the Klarus GL4. It's powerful, easy to use, and built to last. If you're looking for a high-quality tactical flashlight, this is definitely the one to get!

The flashlight is great and I use it a lot but the wires where it connects to the pressure pad are delicate and I had to fiddle with it in order to work

Excellent product and service!

It’s very bright and easy to setup.

Light works great to to bad to mount fair price compared to other lights

Bright, can't get a better unit for the money. Much brighter than most of the others on the market at 3300 real lumens. Not some 800 lumen light claiming to be bright.

Light is bright and a good wide beam. Only comes with a picattany mount m-loc must be purchased separately. The quick disconnect is nice similar to competitors. Very disappointed that the strobe feature does not work with the remote switch, this alone defeated the purpose of it being a “tactical light”. Why design a light like this that has a strobe feature but when you use the option that makes it what it is disables that feature? Fix this and it probably would have been a 5 star review. Going to run this light through some real world testing and will come back and update.

Strobe light and brightness level is not featured on the remote switch however there are buttons for different setting they just don't work, on if you have the original back are these features available.

Wow, this is the BRIGHTEST light I've ever owned. We'll worth it, fits nice on my rifle. It lights up the whole woods at night, with nothing to hide.

Excellent product and service!

Wow, this is the BRIGHTEST light I've ever owned. We'll worth it, fits nice on my rifle. It lights up the whole woods at night, with nothing to hide.