Brinyte PT28 Oathkeeper Flashlight Review

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                                                     The original evaluation article:

 Today I have my first of two Brinyte flashlights.  My first ever from this brand.  This is their tactical offering, and it’s pretty well featured.  It’s an 18650 with magnetic charging and a tactical ring and on and on.  Read on for more!

Official Specs and Features

Here’s a link to the official product page.


I think there’s just one emitter option but there are two body colors.  Desert tan (seen here) and black.


These go for $122 on Brinyte’s store.

Short Review

This is a nice light.  It’s very capable, and meets specification.  The emitter is very cool white (angry white, even), so that’s not my favorite feature.

Long Review

Brynite PT28 Oathkeeper
Emitter:Cree XHP35 HD
Price in USD at publication time:$122.00
Turbo RuntimeHigh Runtime
Switch Type:Dual
On-Board Charging?Yes
Power off Charge Port with no Cell?One mode. With cell: two modes.
Claimed Lumens (lm)1600
Measured Lumens (at 30s)1716 (107.3% of claim)*
Candela per Lumen7.6
Claimed Throw (m)?
Candela (Calculated) in cd (at 30s)630lux @ 5.301m = 17703cd
Throw (Calculated) (m)266.1
All my Brynite 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

  • Brinyte PT28 Oathkeeper flashlight
  • Brinyte 3400mAh 18650
  • Charge cable (USB to proprietary magnetic)
  • Nylon belt pouch (with 18650 holder)
  • Tactical tailcap cover finger ring
  • Paracord lanyard with metal clip

Package and Manual

I didn’t get a manual with this light, unfortunately.  I’d love to have one.  I imagine your purchase will come with a manual.

Build Quality and Disassembly

Build quality is good.  The light feels good in hands.

The tactical ring adds a bit of bulk on the tailcap but that’s expected.

It’s also keyed, so it’ll only go on in one spot, and it won’t spin around when it’s installed.  There’s a little bit of play when installed, but not much.

The threads are unanodized and square cut.  The on-board charging necessitates the inner sleeve, which can be seen peeking out below.

As you’d expect, both head and tail end have springs.  A tactical light needs that.

The body design is well planned enough that the little divot the tac ring is keyed to is very subtle.

The bezel also has some relief to allow light to show when head standing.

Size and Comps

There aren’t any official size specs.  All these measurements are my own.

Light (with clip, without cell, without tac ring): 108g
Tac ring: 18g
Included 18650: 48g

Pretty long light here.

Retention and Carry

I’m not sure what the “most preferred” way to carry the PT28 will be.  The nylon pouch is quite … featured.  There’s a rotating plastic belt loop and a stretchy 18650 holder.

It’s a good pouch.  I don’t really use pouches, but this one is nice.

The head and tail are exposed for use while in the pouch, too.  Also note the 18650 which is installed in the pouch below.

The light also fits with the tactical ring installed.

Also included is a lanyard, which has the features of a normal good lanyard and has a metal clip for very easy attachment.

This clip is likely intended to fit on the tailcap loops (either of 2) but it’ll also fit in two places on the pocket clip.

Another way to handle the light is this tactical ring.  As I said above, it’s keyed, and so won’t rotate when installed, but also has just about 2mm worth of play when installed.

The tac ring doesn’t prevent any other retention option.  Finally, below, see the pocket clip.  It’s a friction fit clip and very snug.  Not a cheap clip either – it has smoothed edges.

Power and Runtime

The PT28 is powered by a single 18650.  Brinyte includes a cell suitable for this light.  It’s also possible to run this light on 2x CR123, because the acceptable top voltage is 6V.

The cell goes in with the positive end toward the head (as with most lights).

Here are two runtime tests.  Turbo and high.

I wasn’t able to test the light with my bench power (something just didn’t work right) but the runtimes do indicate clearly that the light has LVP at around 3V.  High output is exceptionally stable for nearly the entire runtime.

The included charge cable is USB to proprietary magnetic.  That connector connects to the head port seen below.

Charging proceeds at around 2A, which is a good charge rate.  Full charging takes only around 2 hours.

During charge, the indicating switch is red.  When charge is complete, the switch turns green.  If something is wrong, the switch is orange.  All during this time, the magnetic charge connector is blue (bright blue).

Modes and Currents

ModeMode Claimed Output (lm)Claimed RuntimeMeasured LumensTailcap Amps


There’s a bit of ripple on low (left) but no PWM anywhere to be seen.

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

There are two switches on the PT28.  First is the mechanical tail switch.  It has a nice Brinyte logo.

Secondly is the e-switch on the head, which is exactly opposite to the charge port.  This is an indicating switch.  Right after turning the light on, the switch will indicate the charge level, as follows:

Green: ≥70%
Orange: 30-70%
Red Steady: <30%
Red Flashing: <10%

I didn’t get a manual so i could very well miss something in the UI.

Here’s a UI table!

OffClick Tail Switch (TS)On (last used mode)
OffClick Side Switch (SS)No action
OnClick TSOff
OnClick SSMode advance (LMHT)
OnHold SSNo action
OnDouble click SSStrobe
OffTap TSMomentary (Last used)*
OffDouble tap TSMomentary Strobe

* It is not possible to change the mode while in momentary output.

LED and Beam

The emitter is a Cree XHP35 HD, and quite cool white.  I suppose I’d guess it at around 6500K but it could be cooler.  You sort of expect that out of a tactical light, I think, but it can still be a shade jarring.  The reflector is smooth.

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

Tint vs BLF-348 (Killzone 219b version)

Test light is on the left.

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

Random Comparisons and Competitive Options….

Here’s a link to a relevantly filtered page on  I use that site a lot!


What I like

  • Good build quality
  • Complete package
  • Does not require proprietary cell for built-in charging
  • Nice pouch included

What I don’t like

  • Proprietary charge connection
  • Very CW emitter temperature


  • This light was provided by Brinyte for review. I was not paid to write this review.
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