Klarus G15 Flashlight (Floody Cree XHP70.2 and 21700) Review – Better than other 21700 lights?

klarus g25 21700 cree xhp70.2 flashlight feature shot laying on side

Klarus has released a new 21700 light.  This is a floody Cree XHP70.2 light, claiming 4000 lumens and uses a single 21700 cell!  Read on to see how it test, and if it’s better than the competition!


Official Specs and Features

Here’s a link to the official product page.

Versions

There is just one version of the Klarus G15.

Price

These are listing at $89.95 currently.


Short Review

There are a number of things to really love about this light, and a one or two that could improve.  First, this light unlike many similar lights, does not use a proprietary or customized 21700.  That is a massive plus.  The build quality is good, and the output is very nicely thermally managed.  However, this is a cool white light, and has a huge stepdown from the 4000 lumen claim (which it does reach, initially).

Long Review

The Big Table

Klarus G15
Emitter: Cree XHP70.2 (6500K)
Price in USD at publication time: $89.95
Cell: 1×21700
Turbo Runtime High Runtime
LVP?
Switch Type: E-Switch
Quiescent Current (mA): 0.16
On-Board Charging? Yes
Charge Port Type: Micro-USB
Chargetime
Power off Charge Port With Cell: Lowest 3 modes.
Without Cell: No.
Claimed Lumens (lm) 4000
Measured Lumens (at 30s) 2000 (50% of claim)*
Candela per Lumen 2.6
Claimed Throw (m) 188
Candela (Calculated) in cd (at 30s) 423lux @ 3.716m = 5841cd
Throw (Calculated) (m) 152.9 (81.3% of claim)*
All my Klarus reviews!
  • Measurement disclaimer:  I am an amateur flashlight reviewer.  I don’t have $10,000 or even $1,000 worth of testing equipment.  I test output and such in PVC tubes!!  Please consider claims within 10% of what I measure to be perfectly reasonable (accurate, even).

What’s Included

klarus g25 21700 cree xhp70.2 flashlight what's included

  • Klarus G15 Flashlight
  • Klarus 5000mAh 21700
  • Charge cable (USB to micro-USB)
  • Lanyard
  • Carry pouch
  • Spare o-ring
  • Manual

Package and Manual

klarus g25 21700 cree xhp70.2 flashlight box side

In the photo above, the box is a little bit opened.

klarus g25 21700 cree xhp70.2 flashlight manual

Build Quality and Disassembly

klarus g25 21700 cree xhp70.2 flashlight feature shot laying on side

The build quality of the Klarus G15 is fine.  It feels like a sturdy light.

klarus g25 21700 cree xhp70.2 flashlight emitter

klarus g25 21700 cree xhp70.2 flashlight switch

The bezel sits over the edge of the flashlight, and seems to screw in.

klarus g25 21700 cree xhp70.2 flashlight bezel

The body has what seems to be the “new standard” of finish.  Not really knurling, but more of a grip pattern.

klarus g25 21700 cree xhp70.2 flashlight body

klarus g25 21700 cree xhp70.2 flashlight body and tail

The tail/cell tube is one piece.  The light as a whole just has two main parts. Head and tell (cell tube).

klarus g25 21700 cree xhp70.2 flashlight pocket clip

klarus g25 21700 cree xhp70.2 flashlight pocket clip

klarus g25 21700 cree xhp70.2 flashlight lanyard hole

klarus g25 21700 cree xhp70.2 flashlight pocket clip friction fit

klarus g25 21700 cree xhp70.2 flashlight charge port cover closed

klarus g25 21700 cree xhp70.2 flashlight charge port cover open

The head has some texture reminiscent of cooling fins, which probably do help with cooling.

klarus g25 21700 cree xhp70.2 flashlight cooling fins

A thing that surprised me on this light is that the threads are not anodized.  This may affect how you see the “quality” of this light, but to me it does cheapen it just a little bit for me.  The threads work just fine, but bare aluminum on bare aluminum has a “nails on the chalkboard” feel for me that I just don’t enjoy.  Of course overall this probably provides better electrical contact!

klarus g25 21700 cree xhp70.2 flashlight apart

The head has a nice thick double spring.  And note that “retaining ring” (which isn’t really, or at least not in a standard way) which is held down by two Philips screws.

klarus g25 21700 cree xhp70.2 flashlight head spring

The tail end has a nice beefy spring, too.

klarus g25 21700 cree xhp70.2 flashlight both springs

klarus g25 21700 cree xhp70.2 flashlight with cell installed

klarus g25 21700 cree xhp70.2 flashlight ultralow

Size and Comps

Officially 120.6mm long, and 27.6mm in diameter (at the head), and 25.3mm diameter at the tail.

If a light will headstand, I’ll show it here (usually the third photo).  If a light will tailstand, I’ll show that here, too (usually the fourth photo).

Here’s the test light with the venerable Convoy S2+.  Mine’s a custom “baked” edition Nichia 219b triple.  A very nice 18650 light.

And here’s the light beside my custom engraved TorchLAB BOSS 35, an 18350 light.  I reviewed the aluminum version of that light in both 35 and 70 format.

klarus g25 21700 cree xhp70.2 flashlight beside torchlab boss 35

Retention and Carry

The Klarus G15 ships with a friction fit pocket clip installed.  The clip is pleasantly “deep carry” and feels quite snug.

There’s a groove for the clip only on the tail of the light, so bezel down is the only carry option.

klarus g25 21700 cree xhp70.2 flashlight pocket clip friction fit

The lanyard is intended to attach on the tailcap through this hole, but could also attach on the pocket clip if desired.

There is no pouch included and there is no magnet inside.

Runtime

The Klarus G15 is powered by a single lithium ion cell.  Klarus includes an appropriate cell – it’s a button top 21700.  Unlike many other lights in this series (notably by Thrunite and Olight), this 21700 is not proprietary, and other standard 21700 cells will work.  But read more on that later….

klarus g25 21700 cree xhp70.2 flashlight 21700 cell

The button on this cell is short and fat.

The cell goes into the light in the normal orientation, which is with the positive terminal toward the head.

klarus g25 21700 cree xhp70.2 flashlight with cell installed

Here are a couple of runtimes.  Regarding the cell – this light does actually pump out 4000 lumens.  That’s a massive bit of output.  You wouldn’t really expect it to hold that for very long.  But the output is extremely short at that level, and steps down into the 2000 range very quickly.  So my 30 second reading is after the stepdown, and as a result, this light reads “2000 lumens.”  Initial output draws over 12A from the single cell, so while I did say any cell will work in the light, probably not all cells can handle that level of current output.

This light also has some fairly active thermal management.  After the initial stepdown, the output drops in a seeming temperature based pattern, then the output slowly increases again, up to the “2000” lumen range.  This seems to go on until the cell voltage drops, and the light eventually steps down to very low.

High is regulated in much the same way, but the lumen band is narrower.  Due to the light not stepping down so hard, this mode actually reads higher at 30s than Turbo.

The indicating switch gives a short indication of cell voltage, as follows:

Green: 70%-100% power remaining
Orange: 30%-70% power remaining
Red: <30% power remaining
Red Flashing: <10% power remaining

The Klarus G15 also has built in charging, by way of a micro-USB port in the head.  There’s a press-in cover, which fits more specifically that most.

I tried and tried to get a charge cycle logged, but something about this and my charge setup did not work.  I did record it on an alternate device, and I can report that charging is at around 2A.

Modes and Currents

Mode Mode Claimed Output (lm) Claimed Runtime Measured Lumens Tailcap Amps
Turbo 4000 1.2h 2000 12.36
High 2000 1.5h 2213 4.20
Medium 500 6h 557 0.81
Low 100 28h 116 0.14
Moonlight 1 200h ~ ~

Over twelve amps on turbo!!

PWM

There isn’t any PWM, but the middle three mods have an unusual wavy pattern on the scope, but it’s not PWM, and not noticeable.

For reference, here’s a baseline shot, with all the room lights off and almost nothing hitting the sensor.  And here’s the worst PWM light I have ever owned.  Also one of the very first lights I ordered directly from China!

User Interface and Operation

The G15 has a single switch.  It’s an indicating e-switch, with a soft cover.  The switch is positively clicky.


klarus g25 21700 cree xhp70.2 flashlight switch

The indicating is unusual – most often the indicator will be a dot in the center, through which shows the indication.  In this case, the indicating ring is on the outside edge of the switch cover, which I have to say, is very cool.  Below, the switch is indicating in green.

klarus g25 21700 cree xhp70.2 flashlight on showing green switch

Here’s a UI table!

State Action Result
Off Click On (memory, excluding low and turbo)
Off Hold Moonlight
On Hold Mode advance (LMH only)
On Click Off
Any Double click Turbo
Any Triple click Strobe
Strobe Triple click Beacon
Beacon Triple Click SOS
Off Hold 5s Lockout (Two flashes of main to indicate) (further clicks blink 3x red to indicate lockout)
Lockout Click 3x Unlock (Two flashes of main to indicate)

LED and Beam

The emitter in the Klarus G15 is a Cree XHP70.2, with a medium depth orange peel reflector.  The color temperature of the emitter of choice is 6500K, which is cool white.

klarus g25 21700 cree xhp70.2 flashlight emitter

klarus g25 21700 cree xhp70.2 flashlight in hand beamshot

klarus g25 21700 cree xhp70.2 flashlight green indicating switch

These beamshots are always with the following settings:  f8, ISO100, 0.3s shutter, and manual 5000K exposure.

Tint vs BLF-348 (KillzoneFlashlights.com 219b version) (affiliate link)

Test light is on the left!

I compare everything to the KillzoneFlashlights.com 219b BLF-348, because it’s inexpensive and has the best tint!

Conclusion

What I like

  • Complete package
  • Initial output is extremely bright!
  • Regulated and high output in the High mode
  • Uses a regular 21700 cell
  • Regular 21700 cell is included
  • Good UI with easy access to Moonlight and Turbo

What I don’t like

  • The price is a little high, at $89.95
  • Cool white emitter.

Notes

  • This light was provided by Klarus for review. I was not paid to write this review.
  • This content originally appeared at zeroair.org.  Please visit there for the best experience!
  • For flashlight related patches, stickers, and gear, head over to PhotonPhreaks, another site where I write!
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Author: zeroair

2 thoughts on “Klarus G15 Flashlight (Floody Cree XHP70.2 and 21700) Review – Better than other 21700 lights?

  1. The limiting factor on Boost driver lights like this is voltage sag and the driver’s ability to handle high current. Most Boost driver lights with xhp 70.2 tend to only put out between 3000 and 3600 lumen. They must have really beef tip the driver circuitry in order to handle 4000 lumen. So now the limiting factor is going to be voltage sag. You could probably get a much longer turbo run time if you use a cell such as the Samsung 30t.

    1. I have a 30T (I think), so I can try it. Heat will become an issue very quickly at this level.

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