Lumintop D2 Thrower Flashlight Review

Lumintop has released the D2, a thrower style flashlight, which runs on a 21700, and has USB-C charging. Read on for some testing!

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Official Specs and Features

Here’s a link to the Lumintop D2 thrower flashlight product page.

Versions

One body is available but there are two emitter options.  Osram (CW, 5700K) (seen here) and Nichia 4000K.

There are packages available too.  Without cell, with an 18650, or with a 21700 cell.

Price

Base price of the Lumintop D2 Thrower flashlight is $39.95.  The 18650 pushes the price to 45.95.  Adding the 21700 to the flashlight brings the total to $50.95.  My package included the 18650 cell, which is what I’ve used for testing.

And an even better price is available on amazon!  This light with 18650 is selling for under $30 on amazon (referral link).

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Short Review

First of all let’s talk about the general build quality here – it’s fantastic!  Secondly the price.  At $40, this is an inexpensive thrower!  Add in the comparatively small size and this makes a great pocket thrower!

Long Review

The Big Table

Lumintop D2 Thrower Flashlight
Emitter:	Osram GW.Pusra1 PM (5700K)
Price in USD at publication time:	$39.95 $29.95 on Amazon (with cell!)
Cell:	1×21700
Turbo Runtime Graph	High Runtime Graph
LVP?	Switch warning, Off
Switch Type:	E-Switch
Quiescent Current (mA):	0.11
On-Board Charging?	Yes
Charge Port Type:	USB-C
Charge Graph
Power off Charge Port	with cell: all modes without cell: all modes without body: all modes (!!!)
Claimed Lumens (lm)	1000
Measured Lumens (at 30s)	1122 (112.2% of claim)^
Candela per Lumen	45
Claimed Throw (m)	475
Candela (Calculated) in cd (at 30s)	1384lux @ 6.176m = 52790cd
Throw (Calculated) (m)	459.5 (96.7% of claim)^
All my Lumintop 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

• Lumintop D2 Thrower Flashlight
• Lumintop 2600mAh 18650
• 21700 to 18650 adapter
• Charge cable (USB to USB-C)
• Lanyard
• Split ring
• Manual

Package and Manual

Build Quality and Disassembly

As I said above, this is a high-quality flashlight.  High quality, low cost – a great deal.  The D2 is built around the same base of the Lumintop bike flashlight I tested a while back, the B01.

Here’s the top-down view.

On the head are minimal-depth cooling fins, which handle the 3A or so just fine.

Both head and tail are removable from the cell tube.  Below you can see the big spring on the tailcap.

The head has a spring too, but it’s much less beefy.

The cell tube is not reversible.

Despite receiving some grief for the bunny logo, Lumintop is still using it on the switches.

Size and Comps

Officially: 37mm x 115mm x 25.4mm.  The weight is 85g without a 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’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 formats.

Here’s a shorty D2!  Super shorty!

Retention and Carry

The main way for carrying the Lumintop D2 thrower flashlight is the included lanyard, which attaches through these two wholes in the tailcap

 

 

There is no pocket clip, nor is there anywhere to install a pocket clip obtained from another flashlight.  This is one of the nicer features of the light, because the body doesn’t vary much in diameter due to the lack of a pocket clip shelf.

Power and Runtime

Lumintop included an 18650 with this light, so despite it accepting 21700 sized cells, I tested exclusively with this included cell.  Having springs on both ends, it should work with even the shortest 18650s, and also long 21700 cells.  Protected/unprotected, flat top/button top; shouldn’t matter.

The included cell is a button top.

The adapter is just a plastic sleeve – no aluminum or other.  It’s just a diameter adjustment.

Turbo steps down after 12 or so minutes to around 500 lumens, which it holds for around 2 hours.

High looks the same, except it starts at ~500 lumens and holds it for over 2 hours.

Notably, this performance is essentially the same as the B01.

Charging

On the Lumintop D2 thrower flashlight is built-in charging.  It’s by a USB-C port in the head, opposite the switch.  This is one difference from the original B01, which had micro-USB.  The newer B01 (and the one you’d receive if you purchased now) has USB-C too (just like this D2!)  The update is welcome!

Lumintop also includes a USB to USB-C cable.

Charging looks great, but also looks much more suited to 21700 cells.  This 2A charging is almost 1C for the included 18650.  This rate of 1C is not at all “too much!”  However, slower charging could allow a cell to have better longevity.  In any case I’d probably suggest using a 21700 in this light for plenty of reasons, and the charge rate during the CC phase is one of those.

Modes and Currents

Mode	Mode Claimed Output (lm)	Claimed Runtime (for an 18650)	Measured Lumens	Tailcap Amps
Turbo	1000	5m + 2h30m	1122	3.17
High	550	3h 25m	502	0.92
Medium	270	7h 40m	236	0.39
Low	15	82h	15	0.02

Pulse Width Modulation

There is no PWM on any mode.

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, which is 50 microseconds (50us). 10ms.  5ms.  2ms.  1ms.  0.5ms.  0.2ms.  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

The Lumintop D2 thrower flashlight switch is a silicone e-switch in the head, with a Lumintop logo and an indicating LED.  During normal operation, the green color makes the Lumintop rabbit light up nicely.

Here’s a UI table!

State	Action	Result
Off	Click	On (Mode Memory)
Off	Hold (3s)	Strobe
Off	Long Hold (5s)	Lockout^
Strobe	Click	SOS
Lockout	Long Hold	Unlock
On	Hold (1s)	Off
On	Double Click	Turbo
On	Click	Mode Advance (LMH)
Turbo	Click	Previous Mode

^ Yes, to get to lockout you must go through strobe.

LED and Beam

Lumintop states this emitter as an “Osram GW.Pusra1 PM in 5700K”.

I don’t have just a​ ton of experience with this emitter, but it seems to have great output at fairly low currents.

The reflector used is very smooth, and good sized.

You can see below in this “uncalibrated” beamshot that there’s a very tight bit of throw, with fairly even spill.

LED Color Report (CRI and CCT)

The claimed CCT is 5700K, and we do see that on the lowest output.  Above that, the temperature trends much bluer, however.

Beamshots

These beamshots are always with the following settings:  f8, ISO100, 0.3s shutter, and manual 5000K exposure.

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

• Great throw
• Complete package
• Updated to USB-C Charging
• Very flat outputs on all modes other than Turbo
• Turbo holds fairly well at high level
• Nichia version is available

What I don’t like

• Cool to very cool on higher output levels
• User interface is a little quirky

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Notes

• This light was provided by Lumintop for review. I was not paid to write this review.
• This content originally appeared at zeroair.org.  Please visit there for the best experience!
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