Hello everyone 
. 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 
:
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 
.
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 !
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Comment if you want me to check something on the flashlight , or tell your opinion . Thanks !
Check out the light here : Emisar D4
