Cyansky has been making some interesting lights lately, and now they have the Cyansky H5 multi-color hunting flashlight available, too.  This is a 21700 (included) based light, with one white emitter, and a rotating cover which allows red or green, too.  It’s a clever implementation of red and green filters.  Read on for some testing!

Official Specs and Features of the Cyansky H5 Multi-Color Hunting Flashlight

Here’s a link to the official product page.


I believe there is just one version of the H5.


As with the other Cyansky lights I reviewed, I’m unsure of both the price, and where one of these could actually be purchased.

Short Review

The Cyansky H5 has a very interesting implementation of red and green filters.  I love that I am not required to carry around lens covers, and still have access to red and green (as well as the default white).  The interface is nice, and the build quality is good – with one contact issue noted below.  I can’t say what the value for the money is, since a price hasn’t been stated.

Long Review

The Big Table

Cyansky H5 Multi-Color Hunting Flashlight
Emitter: Cree XHP35 HI (With red and green filter also)
Price in USD at publication time: ?
Cell: 1×21700 (included)
Turbo Runtime Graph High Runtime Graph
Switch Type: Dual – Side E-Switch, Mechanical tail switch
Quiescent Current (mA): ?
On-Board Charging? Yes
Charge Port Type: USB-C (on cell)
Charge Graph
Power off Charge Port
Claimed Lumens (lm) 1300
Measured Lumens (at 30s) 1252 (96.3% of claim)*
Candela per Lumen 65.1
Claimed Throw (m) 600
Candela (Calculated) in cd (at 30s) 1649lux @ 6.194m = 63265cd
Throw (Calculated) (m) 503.1 (83.9% 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 h5 what's included

  • Cyansky H5 Multi-color Hunting flashlight
  • Cyansky 5000mAh 21700 (with USB-C Charging) – BL2150U
  • Lanyard
  • Nylon carry pouch
  • Spare tailswitch cover
  • Spare o-ring
  • Charge cable (USB to USB-C)
  • Manual and some paperwork

Package and Manual

I appreciate on the box, that Cyansky has listed appropriate runtime graphs.

Build Quality and Disassembly

cyansky h5 main photo

It’s very interesting how the red and green output are achieved.  There’s a very small disk just below the reflector and above the emitter, than can be rotated by a collar just under the head.  This rotation is easy and smooth, and has detents.

cyansky h5 tail switch

Here’s a photo of the side e-switch, and just below that, the rotating ring for red and green.

cyansky h5 side switch

cyansky h5 side switch

The bezel has a shape that allows light out when headstanding.  I am not sure if this is stainless or not, and I was unable to remove it by hand.

cyansky h5 bezel

The tailcap has minimal (but adequate) grip for removal.

cyansky h5 tailcap

The tailcap also has enough exposed real estate that the H5 will tailstand.

cyansky h5 tailstanding

cyansky h5 lanyard holes

The threads on the tailcap are very thick and beefy.  They’re anodized, square cut, and moderately long.

cyansky h5 tailcap off

The spring in the tailcap is also very beefy.

cyansky h5 tailcap spring

The head end also has a spring.  And a bunch of other stuff.

cyansky h5 head spring

The cell tube is actually removable, which surprised me a little bit.  This is one of the sticking points about the light, which you’ll see again later.  Sometimes the cell tube doesn’t contact the head properly, and the light will either not turn on right, or will shut off during use.  Tightening the cell tube to the head fixed this problem for me every time it happened (at least twice), but it’s still an annoying aspect, and I’m unsure why it happens.

cyansky h5 cell tube removed

Anyway, just be sure when you assemble your parts, that they’re appropriately tight.

cyansky h5 three main parts

cyansky h5 cell installed

The spring in the tailcap, coupled with the length of the cell (and/or the length of the cell tube) mean that the tailcap rests as seen below, and the spring must be compressed significantly to get the threads to grab.

cyansky h5 tight spring

In order to give some idea of the rotating red and green filter, here’s a photo that shows it between states.  Also if you ever wondered how to draw an alien head, this should be a primer on that, too.

cyansky h5 emitter color cover rotary

Size and Comps

The official size is: 64mm x 25.4mm x 182mm.  The H5 weighs 288g without the cell installed.

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 h5 beside torchlab boss 35

It’s not really a small light!  But then, it’s a thrower with some “internal attachments” so the size seems mostly appropriate.

Retention and Carry

I’d say the primary means for carrying the Cyansky H5 is the included belt sheath.  It’s not a “pouch” in the sense that it covers the whole light – the sheath doesn’t cover nearly the whole light.  But it works for what it is.

The H5 will fit in the sheath only one direction, and can be carried only bezel-up.  Otherwise it’ll fall out of the sheath.

Also included is a lanard.  It’s a very simple lanyard, which attaches through two holes in the tailcap.

While looking at some other tailcaps and thinking about tailcap design and holes it occurred to me why sometimes there are two sets of two holes (like the Skilhunt E2A).  Milling time isn’t free!  Holes take time to drill, and that’s two holes worth of extra wear on a tool and machine.  So in some sense it’s “cheaper” to have lanyard holes on just one side of a tailcap.  And what difference is it to a user?  Probably none – who’s going to use two lanyards?  So a net neutral – except sometimes differences are what makes things reliable.  If for example, I know the lanyard is attached on this side and not that side, I might also be able to make some assumptions (or “remember some things”) about other parts of the light – like where the side e-switch is.

It’s a small thing!

Power and Runtime

The Cyansky H5 is powered by a single lithium ion cell.  Cyansky includes an appropriate cell – a 5000mAh 21700, the BL2150U.

cyansky h5 included 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 H5 in the usual way – positive terminal toward the head.

cyansky h5 included 21700 installed

Here are a few runtimes.  Note that the graph looks like it does on the back of the H5 box, all the way down to the bouncing around starting at 40 minutes.

One note about this test – You’ll see two inset graphs here.  During this test, the light started fine, then shut off.  I tightened the body an extremely minimal amount (to wit, I couldn’t actually feel it get any tighter), and the light started working right away again.  I didn’t want to not record that, so you’ll see it in the inset at right.  But I dropped that data out of the file, and that’s the rest of the graph you see.

cyansky h5 runtime graph turbo

In all of the modes that are well regulated (anything below Turbo), they’re very well regulated.  Also, I measure the output to be very near what the claim is, which is appreciated.

cyansky h5 runtime graph HIGH

Both during the testing and on bench power, I did not notice any low voltage protection.  On bench power, the light shut off at 2.4V, which is too low for a cell.  The output does step down noticeably (around 20 lumens or so).

cyansky h5 runtime graph medium


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 h5 21700 usb-c charging

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.

cyansky h5 included 21700 charging indicator

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 consistently 4.19V, a very good termination voltage.

cyansky h5 charge graph

Modes and Currents

The amperage is just repeated for all the output colors, since the light changes only with a filter.  The turbo setting, the current seemed to jump around a little.  I am afraid my bench power may be starting to fail!


Mode Mode Claimed Output (lm) Claimed Runtime Measured Lumens Tailcap Amps
Turbo 1300 3h 1252 6.38
High 450 4h 447 1.24
Med 200 10h 188 0.47
Low 20 60h 20 0.06

I am unable to measure lumens on these other colors, so I have no estimate here.


Mode Mode Claimed Output (lm) Claimed Runtime Measured Lumens Tailcap Amps
Turbo 100 3h 6.38
High 35 4h 1.24
Med 15 10h 0.47
Low 2 60h 0.06


Mode Mode Claimed Output (lm) Claimed Runtime Measured Lumens Tailcap Amps
Turbo 300 3h 6.38
High 104 4h 1.24
Med 46 10h 0.47
Low 5 60h 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 H5.  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 h5 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.

cyansky h5 side e-switch

The user interface is not complicated.

Here’s a UI table!

State Action Result
Off Click Tail Switch (TS) On (last used mode, except strobe)
On Click TS Off
Off Click Side Switch (SS) No action
On Click SS Mode advance L>M>H>T
On Hold SS Strobe (the manual doesn’t cover this!)
Strobe Click SS Return to previous mode
Any Rotate lens bezel Change color (The order is, when turning clockwise: White, Green, Red)

LED and Beam

The emitter is a Cree XHP35 HI. An orange peel deep reflector is used here.  At the very bottom is the emitter.  When in “white” mode, there’s another tiny reflector very close to the emitter.

Each of the colors have a colored lens to cover the tiny reflector.  It’s the same emitter for all the color options – the emitter doesn’t rotate, only a lens cover rotates.

Below you can see what the rotating ring looks like in-between states.

cyansky h5 emitter rotary color cover

The bezel will allow light to escape when headstanding.

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

  • Novel way to administer colored-lens output
  • Modes meet the claimed output level
  • Included cell seems to be high quality
  • USB-C charging on the cell works well
  • Well regulated regulated levels (only exception being turbo, which steps down due to heat – which is acceptable)

What I don’t like

  • Intermittent connectivity issues that require unexpected tightening of the body to the head


  • 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!
  • For flashlight related patches, stickers, and gear, head over to PhotonPhreaks, another site where I write!
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1 thought on “Cyansky H5 Multi-Color Hunting Flashlight Review”

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