Cyansky P25 V2.0 Flashlight Review

The Cyansky P25 V2.0 flashlight is a 3600-lumen flashlight powered by a 21700 cell with a CREE XHP70.3 LED and a dual-switch interface. Read on!

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Official Specs and Features

Here’s a link to the Cyansky P25 V2 flashlight product page.

Versions

In version 2 of the Cyansky P25 V2 flashlight, there seem to be two options. There’s the black body version and this white version. The white version is apparently technically called the “micro-arc” version.

Price

The going price of the Cyansky P25 V2 flashlight is $89.95.

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Short Review

The Cyansky P25 V2 is a solid flashlight, 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 V2 Flashlight
Emitter:	Cree XHP70.3
Price in USD at publication time:	$89.95
Cell:	1×21700
Turbo Runtime Graph	High Runtime Graph
LVP?	Yes
Switch Type:	Dual
On-Board Charging?	Yes
Charge Port Type:	USB-C (On Cell)
Charge Graph
Power off Charge Port	–
Claimed Lumens (lm)	3600
Measured Lumens (at 30s)	3790 (105.3% of claim)^
Candela per Lumen	4
Claimed Throw (m)	208
Candela (Calculated) in cd (at 30s)	444lux @ 5.851m = 15200cd
Throw (Calculated) (m)	246.6 (118.6% of claim)^
Claimed CCT	–
Measured CCT Range (K)	6400-7700 Kelvin
Item provided for review by:	Cyansky
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 V2 flashlight
• Cyansky 5000mAh 21700
• Charge cable (USB to USB-C)
• Nylon pouch
• Lanyard
• Spare clicky cover
• Spare o-ring (2)
• Manual and papers

Package and Manual

Build Quality and Disassembly

This is a rather large light, make no mistake.  But it’s a 21700 cell light, so the size is 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. I said that about the black version too and this one carries on that tradition. It’s white, or “white” – maybe more of an off-white or whatever. It’s nice and unusual!

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:  30mm x 24.4mm x 145.4mm, and 98g 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!

Also seen is 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

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.

Also included is an extremely basic lanyard, which attaches through the two holes below. Holes are on only one side of the tailcap.

Included with the Cyansky P25 V2 flashlight is a nylon pouch.  The light will go into the pouch head up or down, but can’t be used while in the pouch.

Power and Runtime

The Cyansky P25 V2 flashlight is powered by a single lithium-ion cell.  Cyansky includes an appropriate cell – a 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.

Here are a few runtime tests.

When the cell voltage gets low (around 3V, it seems) the switch indicates by blinking red. The light does shut off soon after, though.

Also, upon turning the light on, the indicating switch indicates the approximate state of the cell, too, as follows.

Green: 81%-100%
Green blinking: 51%-80%
Red: 21%-50%
Red blinking: 0%-20%

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.

C to C charging works fine.

Modes and Currents

Mode	Mode Claimed Output (lm)	Claimed Runtime	Measured Lumens	Tailcap Amps
Turbo	3600	2h	3790	14.5
High	800	3h	894	1.37
Med	200	10h	242	0.35
Low	50	25h	55	0.09
Moonlight	–	–	9	0.02

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 V2 flashlight.  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 the previous mode
Off	Hold Side Switch and click Tail Switch	Moonlight mode

LED and Beam

The emitter used in the Cyansky P25 V2 flashlight is a Cree XHP70.3.  I don’t see that the manual states it, but this is not a warmish version of the XHP70.3.

LED Color Report (CRI and CCT)

No real surprises from this cool emitter. The lower modes are cool, at around 6500K. The higher the output, the higher the CCT goes though – all the way up to 7700K.  CRI is low, at around 70.

Beamshots

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 1200 lumens for around an hour and a half (!!)
• Hits output specifications
• Hidden low mode

What I don’t like

• Coolish emitter
• Size

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Notes

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