The Cyansky P25 is a 3000 lumen flashlight powered by a 21700 cell (included) with one CREE XHP70.2 LED, and has a dual-switch interface.  Read on for some thoughts and testing!

Official Specs and Features

Here’s a link to the official product page.


There’s just one version.


The price of the Cyansky P25 is $84.95.

Short Review of the Cyansky P25 3000 Lumen Flashlight

This is a solid light, and really does output a bunch of lumens!!  I feel like it’s a little expensive, at $85, but it does offer a lot for that price – charging, cell included, dual switch interface, etc.  All in all, it’s a nice light.

Long Review

The Big Table

Cyansky P25 3000 Lumen Flashlight
Emitter: Cree XHP70.2
Price in USD at publication time: $84.95 at
Cell: 1×21700
Turbo Runtime Graph High Runtime Graph
LVP? Yes
Switch Type: Both
Quiescent Current (mA):
On-Board Charging? Yes
Charge Port Type: USB-C (On Cell)
Charge Graph
Power off Charge Port No
Claimed Lumens (lm) 3000
Measured Lumens (at 30s) 2449 (81.6% of claim)*
Candela per Lumen 3.7
Claimed Throw (m) 192
Candela (Calculated) in cd (at 30s) 305lux @ 5.341m = 8701cd
Throw (Calculated) (m) 186.6 (97.2% of claim)*
All my Cyansky 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

Cyansky P25 Flashlight what's included

  • Cyansky P25 3000 Lumen Flashlight
  • Cyansky 5000mAh 21700
  • Charge cable (USB to USB-C)
  • Nylon pouch
  • Lanyard (seen below)
  • Spare clicky cover (seen below)
  • Spare o-ring (seen below)
  • Manual and papers

Cyansky P25 Flashlight also included

Package and Manual

Cyansky P25 Flashlight wrong box

Above is the package my P25 shipped in – it’s a P20 box.  Cyansky ships the P25 in the box you see below, mine just happened not to ship in that.  Probably a new model changeover or something.  All the bits were there, though.

Cyansky P25 Flashlight box you'll get

Cyansky P25 Flashlight manual

Build Quality and Disassembly

Cyansky P25 Flashlight

This is a rather large light, make no mistake.  But it’s a 21700 cell light, so the size is somewhat understandable.

The finish – the anodizing, that is – feels great in hand.  Some mix of not quite matte, not quite glossy, that ends up being just right.

From the top down, you can see the light below.  First is the head, which has some lettering, including a screen printed serial.

Cyansky P25 Flashlight top down head

The e-switch on the head has a metal cover, and is very smooth.

Cyansky P25 Flashlight top down e-switch

There’s no knurling.  No knurling anywhere!

Cyansky P25 Flashlight top down cell tube

The tailcap will allow tailstanding, but it’s not terribly reliable.

Cyansky P25 Flashlight top down tailcap

Headstanding, of course, works fine.

Cyansky P25 Flashlight headstanding

In case you didn’t see it in the table above, drink in this big emitter!  This is a Cree XHP70.2.

Cyansky P25 Flashlight emitter

Cyansky P25 Flashlight tailswitch

Threads on the tailcap end of the cell tube are square cut, anodized, and not too long (3.5 turns to remove).

Cyansky P25 Flashlight tailcap off

Also note that big spring in the tailcap.

Cyansky P25 Flashlight tailcap spring

The head end does not have a spring.

Cyansky P25 Flashlight tailcap spring and head button Cyansky P25 Flashlight body threads


Cyansky P25 Flashlight cell installed Cyansky P25 Flashlight on

Size and Comps


29mm x 26mm x 147mm, and 88g without the cell.

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.

Cyansky P25 Flashlight beside torchlab boss 35

Retention and Carry

Included with the P25 is a nylon pouch.  The light will go into the pouch head up or down, but can’t be used while in the pouch.

Also included, and attached from the factory, is a friction fit belt or pocket clip affording bezel down carry only.  This isn’t a deep carry clip, but due to the length of the light, it’s balanced fine.

Clip hug!

Cyansky P25 Flashlight pocket clip hug

Also included is an extremely basic lanyard, which attaches through the two holes below.

Cyansky P25 Flashlight lanyard holes

Holes are on only one side of the tailcap.

Cyansky P25 Flashlight no lanyard holes

Cyansky P25 Flashlight lanyard and stuff


Power and Runtime

The Cyansky P25 is powered by a single lithium ion cell.  Cyansky includes an appropriate cell – a 5000mAh 21700, the BL2150U.

Cyansky P25 Flashlight included 5000mah 21700

As far as usage goes, this is a standard button top 21700.  It has some additional features, which I’ll cover below.

The cell fits into the P25 in the usual way – positive terminal toward the head.

Cyansky P25 Flashlight included 5000mah 21700 installed

Here are a couple of runtimes.

Cyansky P25 Flashlight runtime graph turbo

Output on high is fairly flat, and steps down.

Cyansky P25 Flashlight runtime graph high


As stated, the cell has some other features too.  There’s built-in USB-C charging, by way of a USB-C port on the positive terminal end.

Cyansky P25 Flashlight included 21700 usb-c charge port

Another feature is a little indicating LED right in the positive terminal of the 21700.  When charging, this indicator is red.  When charging is complete, the indicator is green.  Otherwise, the indicator is not on at all.

An appropriate cable is included – USB to USB-C.

Charging proceeds at a fairly slow 1.5A or so, which is well under 0.5C for this 5000mAh cell.  Time required is around 3.5 hours, and the terminal voltage seems to be around 4.16-4.17V.

Cyansky P25 Flashlight included 21700 usb-c charge graph

Modes and Currents

Mode Mode Claimed Output (lm) Claimed Runtime Measured Lumens Tailcap Amps
Turbo 3000 3h 2449 ~8 (or more)
High 500 6h 1465 2.15
Medium 150 24h 0.38
Low 30 150h 0.06

Pulse Width Modulation

No modes utilizes pulse width modulation.

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

Two switches are used for control of the Cyansky P25.  First is the mechanical tail clicky.  It’s a forward clicky, which allows momentary actuation.  This switch also serves as a mechanical lockout to prevent any parasitic drain on the cell.

Cyansky P25 Flashlight tail switch

The switch cover is big but the switch itself is normal sized.  It’s not terribly thick, so you can feel the actual switch underneath.  The clicky is very clicky and the action is low.

The second option for operation is the e-switch on the side near the head. This switch is metal(ish?) and very proud.  Also it doesn’t compete with anything else, so it’s very easy to find without looking.

The user interface is not complicated.

Here’s a UI table!

State Action Result
Off Click Tail Switch On (last used mode, except strobe)
Off Tap Tail Switch Momentary (last used mode, except strobe)
On Click Tail Switch Off
Off Click Side Switch No action
On Click Side Switch Mode advance L>M>H>T
On Hold Side Switch Strobe (the manual doesn’t cover this!)
Strobe Click Side Switch Return to previous mode

LED and Beam

The emitter used in the Cyansky P25 3000 lumen flashlight is a Cree XHP70.2.  I don’t see that the manual states it, but this is not a warmish version of the XHP70.2.

Cyansky P25 Flashlight emitter

The reflector has a very light orange peel texture.

Cyansky P25 Flashlight on

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

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

Test light is on the left!

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


What I like

  • Complete package light
  • Good (and simple) dual switch interface
  • Included cell with USB-C charging
  • Fairly flat output of nearly 1200 lumens for around an hour and a half (!!)

What I don’t like

  • Coolish emitter
  • Size


  • This light was provided by Cyansky for review. I was not paid to write this review.
  • This content originally appeared at  Please visit there for the best experience!
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