Lumintop PK27 Flashlight Review

Lumintop PK27 Flashlight Review

The Lumintop PK27 is a small AAA-sized flashlight with just three simple modes and a mechanical clicky. Great throw, too! Read on for more!

Official Specs and Features

Here’s a link to the Lumintop PK27 flashlight product page.


Just one version, I think!


This AAA thrower sells in the low $20 range. 

Short Review

I’m not completely sure what role the Lumintop PK27 flashlight is supposed to fill. My guess is that there are some who were not interested in the Lumintop GT Nano for some reason, and the PK27 was introduced for those people. I would recommend the GT Nano over the PK27, I think, namely because the PK27 does not (officially) support 10440 cells (and definitely not two 10440 cells!). Otherwise, this is a good and very simple AAA or 2xAAA thrower – sort of an inexpensive fun novelty.

Long Review

The Big Table

Lumintop PK27 Flashlight
Emitter: Osram NM1
Price in USD at publication time: $25.95
Cell: 1xAAA or 2xAAA
Runtime Graphs
Switch Type: Mechanical
On-Board Charging? No
Claimed Lumens (lm) 300
Measured Lumens (at 30s) 219 (73% of claim)^
Candela per Lumen  
Claimed Throw (m) 270
Candela (Calculated) in cd (at 30s) 303lux @ 4.533m = 6226cd
Throw (Calculated) (m) 157.8 (58.4% of claim)^
Claimed CCT
Measured CCT Range (K) 5300-6200 Kelvin
Item provided for review by: Lumintop
All my Lumintop 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

Lumintop PK27 flashlight what's included

  • Lumintop PK27 flashlight
  • Lanyard
  • Spare o-rings (2)
  • Manual

Package and Manual

Lumintop PK27 flashlight lens cover

Lumintop PK27 flashlight manual

Lumintop PK27 flashlight manual

Build Quality and Disassembly

Lumintop PK27 flashlight

Lumintop PK27 flashlight bezel and head

That cell tube can be broken down – this is how you select between one and two AAA cells. 

Lumintop PK27 flashlight parts broken down

The spring on the mechanical clicky is very basic.

Lumintop PK27 flashlight tailcap spring

On the head end, there’s just a brass button. This is normal; no issue there!

Lumintop PK27 flashlight head and tail contacts

This extension tube is directional.

Lumintop PK27 flashlight extension tube removed

The build quality is fine and I wouldn’t say there are any issues to mention.

Size and Comps

Size 135 x 24 x 14.5mm (Length x head x tube)
Net Weight 38g (excluding battery)

I’ve tried to capture both AAA and AAAx2 modes in the photos below. 

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).

Lumintop PK27 flashlight 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.

Below you can see the Lumintop PK27 flashlight beside the Lumintop Frog, another similarly-sized light. The Frog (like the GT Nano) runs on lithium-ion cells, though.

Lumintop PK27 flashlight beside comparables

Retention and Carry

Only a lanyard is included for carrying the Lumintop PK27 flashlight. It attaches through one of these holes in the tailcap.

Lumintop PK27 flashlight lanyard installed

Power and Runtime

As stated above, the Lumintop PK27 flashlight runs only on 1.5V cells. Lithium-ion is not permitted – so not 10440 cells!

The package includes everything you’ll need for running one or two AAA cells, though. Seen below is the single-cell option. The cell goes into the light in the usual way – positive end toward the head. 

Lumintop PK27 flashlight aaa installed

Output is markedly different between one and two cells. It’s much higher with two cells! The runtime is nearly the same, too. 

Lumintop PK27 flashlight runtime graphs

Lumintop PK27 flashlight runtime graphs

Lumintop PK27 flashlight runtime graphs

I wouldn’t describe the light as having low voltage protection, but for these 1.5V cells, that’s not the worst characteristic.

Modes and Currents


Mode Mode Claimed Output (lm) Claimed Runtime Measured Lumens Tailcap Amps (@3V)
High 300 20m 219 0.86
Medium 40 17h 25 0.09
Low 0.5 72h 0.34 ~


Mode Mode Claimed Output (lm) Claimed Runtime Measured Lumens Tailcap Amps (@1.5V)
High 96 2.32
Medium 4 0.02
Low 0.16 ~

Pulse Width Modulation

The light does not use PWM with AAA or 2xAAA.

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

Control of the Lumintop PK27 flashlight is by a single mechanical tail switch. It’s a reverse clicky, so when the light is on, mode changes are possible.

Lumintop PK27 flashlight tail switch

Lumintop PK27 flashlight tail switch profile

Lumintop PK27 flashlight tail switch actuation

Here’s a UI table!

State Action Result
Off Click High
On Click Off
On Tap Mode Advance (HML)

LED and Beam

Lumintop has used a very throwy Osram NM1 in the PK27. 

Lumintop PK27 flashlight emitter

That’s coupled with a smooth reflector, which really promotes throw.

Lumintop PK27 flashlight reflector

Lumintop PK27 flashlight emitter on

LED Color Report (CRI and CCT)

CRI and CCT are about what we expect from an NM1. On the higher modes (left, below), the CCT is “bluer” or cooler. Low is good, though, at around 5300K. CRI is low. Since AAA and 2xAAA are driven differently, I’ve included CRI and CCT reports for both!


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

  • Uses AAA (that is, 1.5V cells)
  • Comes with what you need for running one or two AAA cells
  • Very simple user interface
  • Great throw

What I don’t like

  • Uses only 1.5V cells


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