Review : Emisar D4 (single 18650 & quad led flashlight)

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giorgoskok's picture
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Review : Emisar D4 (single 18650 & quad led flashlight)

Emisar D4 Review

Hello everyone Smile . I’m writing a short review on Emisar D4 , a powerful quad led flashlight , made by Emisar (Brand of Intl-outdoor). You probably already know about this light , but i thought i would write some words too.

Overview/Specifications :

• CNC machined from aircraft-grade aluminium
• Efficient UK made Carclo Quad LED optics
• Anti-reflective coated glass lens
• Unihead construction
• High lumen output and low moon output
• Ramping interface
• Electronic soft touch switch (ALPS)
• Beryllium-Copper springs with 45% IACS superior to stainless steel alloys used for springs with only 2% IACS.
• Temperature step-down
• Waterproof and dustproof to IP67 standard (up to 1 meter)
• Default 18650 body with optional 18500 or 18350 battery tube
• Dimensions: 94mm(length) * 28mm(head) * 24mm(body), 80mm(lenght 18500), 63.5mm(lenght 1835)

OTF lumen output at start-up
XP-G2 S4 : 3300lm
Nichia 219C : 3500lm
XP-L HI : 4300lm

The flashlight i have in this review is the gray xp-l hi v2 3a version .

First Look :

Flashlight in it’s small box , a classic brown box . The box has the Brand name , model , color and the version written on it :

Inside , we have the flashlight , the 18350 tube (optional) and the 18500 tube (optional) .

Package Contains :

  • Flashlight
  • O-rings

A closer look :

You can see the flashlight :

The flashlight has an electronic switch on the side of the head , and not a regular rear-clicky switch :

The switch is on a flat , and slightly raised area on the head , which makes locating the switch pretty easy (and also it doesn’t let the flashlight roll) :

Of course we need to see where the magic happens . On the front , we meet 4 leds , 4 xp-l hi’s in this occasion under a Carclo optic :

Over the optic , there is an AR coated lens , to protect the optic :

Around the switch , the head has some cooling fins to help cooling the beast Big Smile :

On the other end , we have the tailcap . I really like the design , as it has offers a nice grip to the user when changing batteries :

It has the Emisar logo along with the model name :

If we unscrew it we find some smooth “square” threads on the tube :

Of coure tube is removable :

Head has an astonishing design , really small and robust :

Here is the back side of the driver , whith the a low resistance gold plated bellirium copper spring :

Inside the tailcap we have a simple contact plate , with the same bellirium copper spring :

Let’s take a look now at the different option we have with the different tubes …

Flashlight , by changing battery tubes can accept 3 different types of batteries : 18350 , 18500 and 18650

With 18350 tube (18650 battery for comparison) :

Max length is only 64mm with the 18350 tube :

With 18500 tube (18650 battery for comparison) :

Max length is only 78,5mm with the 18500 tube :

And of course you saw already the 18650 version :

Max length is 94mm with the 18650 tube :

And the other dimensions :

Max diameter of tube is 24mm

Max diameter of head is 30mm

General info , driver info , UI etc :

Let’s begin with the driver …

D4’s driver has the direct drive abillity , it is usually called fet driver by modders . What’s special about this driver , is exactly this thing , that the leds can get the max current the battery can provide (of course limited by the leds’ forward voltage , the battery(ies) etc) .
With that explained , lower resistance batteries will give higher output at “turbo” mode (With shorter runtimes and great amount of heat coming from the leds) . Batteries recommended for max output are Sony VTC5A / VTC6 / VTC5 and Samsung INR18650-30Q etc

Driver’s UI isn’t like regular e-switch lights with modes , but features ramping mode , often mentioned as stepless dimming . It is pretty simple to use and remember . Firmware is written by Tom E and Toykeeper.
It has built in programmable thermal regulation , so the body of the flashlight doesn’t get really hot to touch , based on your preference .

Here is a simple schematic and explanation of the UI (Credits : Toykeeper) :

Single click one ! Single click off !

When on : Press continiously to ramp up/down to the desirable level .

When off : Short click goes to last accessed level , long click goes to the lowest mode , and double click to turbo .

Measurements :

Sony US18650VTC5

Lumens :

  • Lowest – 0,9 lumen
  • 7135 100% – 144 lm lumens
  • Turbo – 4180 lumens

So you can actually have from 1 to 4180 lumens without restriction on modes Wink .

Current draw , in standby mode (parasitic drain while flashlight is off) : 0.02mA

Intensity : 20,8kcd

Note : For the xp-l hi version that draws up to 16 amps i would recommend using a 30 amp battery like Sony VTC5 / VTC5A

My test :

Turbo mode , thermal regulation set at 49C , showing the thermal regulation (first 20m) :

Beamshots :

Close distance to wall :

Xp-l hi seems to create a slightly squarish beam on the edges , that i hardly notice when using the flashlight ooutside . Tint is nice neutral white .

Wall @ 12m :

Control shot :

7135 100% (350mA @ led) :

Turbo :

Some words from me :

An astonishing pocket rocket , which can provide a great amount of light if needed (= not for super long time) , with an awesome UI and many cool features as i mentioned !


Comment if you want me to check something on the flashlight , or tell your opinion . Thanks !

Check out the light here : Emisar D4

Edited by: giorgoskok on 10/06/2017 - 10:45
giorgoskok's picture
Last seen: 21 hours 56 min ago
Joined: 11/13/2015 - 10:46
Posts: 2343
Location: Greece

Reserved for updates .

I have some little details & some more beamshots to add Thumbs Up

Last seen: 1 day 13 hours ago
Joined: 08/26/2014 - 06:53
Posts: 489
Location: Australia

Thanks for the review buddy. I’ve got all 3 emitter types for the D4 but I still enjoy reading about it Smile

Last seen: 7 hours 18 min ago
Joined: 08/27/2015 - 22:34
Posts: 91
Location: United States

Nice! Appreciate the review!

I’ve had the XP-L 5000k, XP-G (4000k and 5000k) and the Nichia 219c 5000k 80cri. Favorite is the XP-G 4000k so far.

giorgoskok's picture
Last seen: 21 hours 56 min ago
Joined: 11/13/2015 - 10:46
Posts: 2343
Location: Greece

Haha i see I’m not the only one that would like to have every available version … For sure one of the best pocket throwers out there Wink