Emisar D1S Flashlight Review

Official Specs
Short Review
Long Review
  What's Included
  Manual and Packaging
  Build Quality and Durability
  User Interface and Operation
  LED and beam
  Tint vs...
  Beamshots, Runtime, etc table.
  What I like
  What I don't like
Parting Shot
Up Next


Emisar has been killing it lately.  Just released is this D1S, their throwiest offering yet.  I am pleased to have one, as I don’t like the typical entry into throwy 18650 lights (that is, the C8).  Let’s see how it stacks up!


Official Specs and Features


There are two anodization colors; black and grey.  Here is seen grey.  And there are 3 emitter options, all Cree XP-L.  1A, 3A, and 5D (coolest to warmest).  I have the 5d.


The can’t-be-beat price of $40!

Short Review

Since I got this light I sold every C8 I owned.  This throws better, has a better UI (unless you just really really love fw tail clickies), and is just more fun.  I really love this one.

Long Review

What’s Included

  • Emisar D1S flashlight
  • Spare o-rings (2)


Package and Manual

As with other Emisar lights, this one ships in a cardboard box, which has a generic branded label.  It’s a fine package.


There is no manual included.  The UI etc may be seen on the product page.

Build Quality and Disassembly

This is a nice light with build quality commensurate with price.  The anodizing seems thin (and is quite grippy, which may or may not be good depending on your taste).


The threads are ok.  They look very nice, but they’re a touch grainy (like titanium threads, if you’ve ever experienced those.)  The threads are very nicely square cut, and also anodized.  My guess is that with some use, the threads will smooth out, namely when the ano begins to wear.

The tailcap also has some pronounced reeding, which makes unscrewing very easy.


The bezel unscrews easily, and the mcpcb can be seen and accessed.  I am not sure how the driver is installed, to be sure.



Officially: Length: 127mm, Head Diameter: 50mm, Tube Diameter: 24mm, Tailcap Diameter: 25.6mm.  The head is quite large, on such a small body, but that’s not unheard of.  (I think of the Nitecore P30, which has very similar dimensions.  And I really liked that light, too.)


It’s not pocketable by any means.  I didn’t even consider the D1 pocketable, and this light is much bigger than the D1.  Below, it’s seen with the D4, which is quite pocketable.



Nothing is provided.  As the body tube is reused from other Emisar offerings, there are pocket clips slots.  But it’s unlikely that a pocket clip would be very useful on this big-head-light.

No pouch is provided, either.


The Emisar D1S is powered by a single 18650 cell.  It’s slightly picky, not preferring longer cells, or button top cells.

I’ve been asked about other Emisar lights so to be sure:  The positive end of the cell goes toward the head of the light.  Some Emisar lights did have an issue with reverse polarity, but I believe that’s been addressed.  I’d still be sure to put the cell in the correct way.  Mtn actually addresses this specifically:

Do not insert the battery backwards.  There is short-term driver protection, but damage will occur to the battery and flashlight if the battery is left inserted backwards for an extended period of time.  If the battery is inserted correctly, the light will give two quick blinks when the battery is connected.


The D1S has a dynamic temperature-based output on Max output.  It also has low voltage protection, as can be seen in the graph.


User Interface and Operation

There’s a single switch on this light, a side e-switch.  It’s big, responsive, easy to find, and positively clicky.  I really like the switch!


The UI is very rich.  I can’t describe it all, but the flow chart by u/ToyKeeper is quite descriptive.  Yes, it’s labeled as the D4 UI.  Yes, the UIs are the same.  (Yes, that’s a good thing.)



As a ramping light, “modes” is not as applicable.  But note in the flow chart above, all the accessory modes available.  Lockout, beacon, Thermal configuration, battery check, tactical momentary.  Really, quite a lot of options.

LED and Beam

There are three choices of tint for this D1S, and I opted for the warmest.  This is a Cree XP-L HI 5D.  It’s quite warm, no doubt.  I like warm, so that’s good.  And warm in a thrower is… maybe not “unusual” but it’s something to behold, when one’s accustomed to much cooler throwy lights.

The beam is very much throw.  The emitter sits under a very smooth, big reflector.  The beam is – unlike the D1 – very concentrated on the focus point.  (Just to contrast, the D1 has a defined hotspot, but it’s perfectly even all the way across the hotspot.)


Tint vs BLF-348


Beamshots, Runtime, and Lux Measurements

Emisar D1S
Emitter XP-L HI
Emitter Notes V2 5D – Neutral/Warm White
Cell 18650
Glamour Shots Beamshots [0.3″, f/8, ISO 100, 5000k]
Runtime 18650
LVP? Warning
Claimed Lumens (lm) 1300
Lux (Measured) 3320 lux @ 6.306 m
Candela (Calculated) in cd 132021.9
Throw (Calculated) (m) 726.7
Throw (Claimed) (m) 721


Random Comparisons and Competitive Options….

There’s not a lot that actually compares to the Emisar D1S  The UI is special, the throw for form-factor, the price…. It’s ridiculous.  If you think something else compares, … at $40, just buy both!!


What I like

  • UI
  • Throw
  • Tint options
  • Side switch

What I don’t like

  • Anodizing is too gritty.  Not grippy, but actually too much.

Up Next

Got a few reviews sitting on “go,” just have a bunch of writing to do!  The most ready currently are the Nitecore HC70 and the JETBeam TH20.  Hope to finish those this week, too!


  • This light was provided by me! for review. I was not paid to write this review.
  • This content originally appeared at zeroair.wordpress.com.  Please visit there for the best experience!
  • Whether or not I have a coupon for this light, I do have a bunch of coupons!!  Have a look at my spreadsheet for those coupons.  Note I’ve upgraded that sheet so that now, you may subscribe and get notifications when the sheet is edited!!

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