Cyansky HS3R Mini Headlamp Review

Cyansky HS3R Mini Headlamp Review

Cyansky released the HS3R, a 16340-cell headlamp that offers both white outputs as well as a secondary red, and USB-C charging! Read on!

Official Specs and Features

Here’s a link to the Cyansky HS3R Mini headlamp product page.


I believe there’s just one version of the Cyansky HS3R Mini headlamp. 


Cyansky has the HS3R Mini headlamp listed at $59.95. It’s available on their site.

Short Review

Four outputs in the main level are fine, but Eco (lowest white) seems a bit hidden away in the user interface. Red secondary is great (again, it could use an extra lower mode, too.) The user interface is good and the whole package is good, too. USB-C charging works nicely and is quick, too. 

Long Review

The Big Table

Cyansky HS3R Mini headlamp
Emitter: Osram Duris P9 (“Cold white”)
Price in USD at publication time: $59.95
Cell: 1×16340
Runtime Graphs
LVP? Questionable
Switch Type: E-Switch
Quiescent Current (mA): ?
On-Board Charging? Yes
Charge Port Type: USB-C
Charge Graph
Power off Charge Port With cell: one medium-ish mode
Without cell and/or tailcap: one medium-ish mode
Claimed Lumens (lm) 1100
Measured Lumens (at 30s) 1026 (93.3% of claim)^
Candela per Lumen 4.00
Claimed Throw (m) 135
Candela (Calculated) in cd (at 30s) 202lux @ 4.766m = 4588cd
Throw (Calculated) (m) 135.5 (100.4% of claim)^
Claimed CCT Cold White
Measured CCT Range (K) 5800-6400 Kelvin
Item provided for review by: Cyansky
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 HS3R Mini Headlamp what's included

  • Cyansky HS3R Mini headlamp 
  • Cyansky 700mAh 16340
  • Headband
  • Charging cable (USB to USB-C)
  • Manuals etc
  • Spare o-rings (2)
  • Carry pouch
  • Lanyard

Package and Manual

Cyansky HS3R Mini Headlamp manual

Build Quality and Disassembly

Cyansky HS3R Mini Headlamp

Build quality is good. There’s nothing too much worth mentioning, and definitely, nothing bad to mention. For some reason, I really like these tailcaps that Cyansky has used on the HS3R. This tailcap is just like the one on the Cyansky HS5R – in fact, these two share MANY features. (It’s really the same light, just two sizes of the light.)

There’s a magnet in that tailcap, too.

Cyansky HS3R Mini Headlamp tailcap off showing magnet

The tailcap has a spring, but the head (unlike the HS5R) has only a button for contact.

Cyansky HS3R Mini Headlamp showing positive contact

Size and Comps

69mm x 33.3mm x 41.4mm
37g (light only). 55g (with battery). 92g (with headband, battery, bracket)

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).

Cyansky HS3R Mini Headlamp in hand

Here’s the test light with the venerable Convoy S2+.  Mine’s a custom “baked” edition Nichia 219b triple.  A very nice 18650 light.

Also above 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

Mainly the Cyansky HS3R is a mini headlamp. So of course the first thing to mention is this headband.

Cyansky HS3R Mini Headlamp headband connector

The band itself is super comfortable. Even this metal bracket has a back that gels with a forehead very nicely. The edges are rounded out and it’s overall just good.

But have a look at the bracket that holds the HS3R. This bracket is a huge improvement over the HS5R. The light can be removed without damage and without special tools. It’s still “very metal” but it’s acceptable.

Cyansky HS3R Mini Headlamp headband connector

Cyansky HS3R Mini Headlamp headband

Cyansky HS3R Mini Headlamp headband adjustment

Cyansky HS3R Mini Headlamp headband forehead contact

Cyansky HS3R Mini Headlamp mounted on headband

The included lanyard attaches through this tiny hole in the tailcap.

Cyansky HS3R Mini Headlamp lanyard

Cyansky HS3R Mini Headlamp mesh carry bag

As mentioned, the tailcap has a magnet, and this magnet is perfectly sufficient for holding the light stable. 


Power and Runtime

The Cyansky HS3R mini headlamp is powered by a single lithium-ion cell.  Cyansky includes an appropriate cell – a 700mAh 16340. 

Cyansky HS3R Mini Headlamp included 16340 cell

This is a standard button-top cell and it has a micro-USB charging port. Don’t get sidetracked by that, though – the Cyansky HS3R Mini headlamp has great USB-C charging built into the light.

Cyansky HS3R Mini Headlamp standard cell with micro-usb charge port

The cell goes into the HS3R in the normal way – positive terminal toward the head.

Cyansky HS3R Mini Headlamp cell installed

Below are the runtime tests. Performance looks pretty solid. In fact, performance is exactly like that of the HS5R, just lower in total output. 

Cyansky HS3R Mini Headlamp runtime graphs

Cyansky HS3R Mini Headlamp runtime graphs

Cyansky HS3R Mini Headlamp runtime graphs

Cyansky HS3R Mini Headlamp runtime graphs

I’m not completely inclined to say that the Cyansky HS3R Mini headlamp has low voltage protection, because shutoff was sometimes not observed, and/or low. 


Just like the Cyansky HS5R headlamp, the HS3R has a charge port built into the flashlight.  It’s a USB-C port, and it’s on the side of the head. I don’t usually opine about charge port covers, but I happen to really like this one.

Cyansky includes a USB to USB-C charging cable.

Cyansky HS3R Mini Headlamp charging cable

I tested with both USB to USB-C (as that’s what cable is provided) and with C to C.  Both worked fine, and have similar profiles and charge time.

Cyansky HS3R Mini Headlamp charging graph

Cyansky HS3R Mini Headlamp charging graph

Modes and Currents

Mode Mode Claimed Output (lm) Claimed Runtime Measured Lumens Tailcap Amps
Turbo 1100 45m 1026 4.74
High 400 1h 353 0.61
Med 130 3.5h 113 0.19
Low 25 16h   0.03
Red 15 7h   0.09
Eco (White 5 60h   ~

Pulse Width Modulation

Below are the white output modes, lowest to highest. There isn’t PWM on any of them.

For reference, here’s a baseline shot, with all the room lights off and almost nothing hitting the sensor.  Also, here’s the light with the worst PWM I could find.  I’m adding multiple timescales, so it’ll be easier to compare to the test light.  Unfortunately, the PWM on this light is so bad that it doesn’t even work with my normal scale, with is 50 microseconds (50us).  10ms5ms2ms1ms0.5ms0.2ms.  In a display faster than 0.2ms or so, the on/off cycle is more than one screen, so it’d just (very incorrectly) look like a flat line.  I wrote more about this Ultrafire WF-602C flashlight and explained a little about PWM too.

User Interface and Operation

If you’ve had the Cyansky HS5R, you’ll be familiar with this switch. It’s exactly the same! It’s an indicating e-switch, too.

Cyansky HS3R Mini Headlamp e-switch

Cyansky HS3R Mini Headlamp e-switch indicating in green

Here’s a UI table!

State Action Result
Off Click Battery check displayed on the indicating switch ^
Off Hold Switch On (Mode Memory (Turbo memorizes as high))
On Click Switch Mode advance (LMHT)
On Hold Switch Off
Any Hold Switch >1.2s Iterate between main white emitter and secondary group (which also includes Eco white)
On Secondary Click Switch Mode advance (Red, Eco White, Red Blink)
Off Double click Lockout
Lockout Double click Unlock
Lockout Click White blinks 2x, plus battery check^

^ Battery check indicates as follows:

Green: >80%
Green Blinking:  50-80%
Red: 20-50%
Red Blinking: <20%

There are no strobes.  There’s red blinking, but it’s slow, maybe 1Hz.

LED and Beam

The emitter Cyansky uses in the HS3R Mini headlamp is stated as an Osram P9. 

Cyansky HS3R Mini Headlamp emitter and TIR

This emitter has a TIR.

Cyansky HS3R Mini Headlamp beamshot

Despite being hidden behind the TIR and not visible, there are also two red emitters. The red is quite bright.

red output

LED Color Report (CRI and CCT)

I’ve used the same mode order as above. Four main white modes then red. Cyansky really nails it when saying this is a cold white emitter. CRI is also not spectacular. But the output is great!


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)

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

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


What I like

  • USB-C charging works great
  • Red emitter is a nice bonus
  • Nice tight throwy beam
  • Simple user interface
  • Output is really great
  • Complete package – Cyansky includes the cell at the purchase price.

What I don’t like

  • Red has only one level – I could really use a lower (much lower) level
  • Eco (white) is hidden in the red group
  • Double click (from off) to lock is a bit annoying (because double click means “Turbo” in just about every other light.
  • Double click (from on) not doing anything is a bit annoying.


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