Cyansky P25 3000 Lumen Flashlight Review

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.

Versions

There’s just one version.

Price

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 Cyanskylight.com
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:  Testing flashlights is my hobby. I use hobbyist-level equipment for testing, including some I made myself. Try not to get buried in the details of manufacturer specifications versus measurements recorded here; A certain amount of difference (say, 10 or 15%) is perfectly reasonable.

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

Package and Manual

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.

Build Quality and Disassembly

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.

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

There’s no knurling.  No knurling anywhere!

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

Headstanding, of course, works fine.

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

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

Also, note that big spring in the tailcap.

The head end does not have a spring.

 

Size and Comps

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

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

Here’s the test light with the venerable Convoy S2+. Mine is 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 formats.

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!

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

Holes are on only one side of the tailcap.

Power and Runtime

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

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.

Here are a couple of runtimes.

Output on high is fairly flat and steps down.

Charging

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.

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.

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 mode utilizes pulse width modulation.

Here you can see a “baseline” – a chart with almost no light hitting the sensor.

Then there’s the Ultrafire WF-602C flashlight, which has some of the worst PWM I’ve seen. It’s so bad that I used a post about it to explain PWM! Here are multiple timescales (10ms, 5ms, 2ms, 1ms, 0.5ms, 0.2ms) to make comparing this “worst” PWM light to the test light easier. That post also explains why I didn’t test the WF-602C at the usual 50us scale.

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.

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 user interface 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.

The reflector has a very light orange peel texture.

These beamshots always have the following settings:  f8, ISO100, 0.3s shutter, and manual 5000K exposure. These photos are taken at floor level, and the beam hits the ceiling around 9 feet away.

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

I keep the test flashlight on the left and the BLF-348 reference flashlight on the right.

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 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

---

Notes

• This light was provided by Cyansky for review. I was not paid to write this review.
• This content originally appeared at zeroair.org. Please visit there for the best experience!
• Please use my Amazon.com referral link to help support zeroair.org!