My Emisar D1 arrived the other day, purchased from a US retailer. The box has the name “EMISAR High Power Illumination” and the model/tint but no manufacturer name or address and no literature inside (no manual, no warranty info). Seems odd.
At $40 it is my most expensive light but the bare bones packaging and lack of a manual isn’t on par.
Well the company is Emisar, and just like with any other brand like Nitecore or Thrunite I don’t think we know who actually manufactures the lights. The person behind the Emisar design is Hank Wang who’s also behind the Noctigon M43. You can contact him here: https://intl-outdoor.com/
User interface is called D4 v2, by BLF members Tom E and Toykeeper. There’s a handy guide on mtnelectronics or intl-outdoors.com websites.
Acme
Yes, Hank and MntElec do have that diagram but a manual sure would explain it better. Those diagrams don’t explain how some of those modes work, just how to get to them. For example, I see how to click to BattCheck or TempCheck or Lockout Or ThermalCfg but I have nothing that explains each of those functions.
Fortunately there is a BLF post where I learned the ramping and BattCheck but will have to go back and re-read to see if these other functions are explained. Apparently I’m alone in expecting a moderately priced light to have some basic literature and contact info for warranty. I actually like to (and need to) read the manuals
As stated above, Intl-Outdoor makes Emisar. About who actually does the manufacturing though, um, Chinese manufacturing is complicated. There were probably several other companies involved… one or more for the aluminum machining, one or more for the anodizing, one or more for the driver manufacturing, etc. And at least two different companies make the LEDs. I think the driver designs were contracted independently, and the firmware was also contracted out to at least two people.
At the center is Hank, who did a lot of the design, organized everything, and also does the retail side.
Thanks! That explains it. I didn’t necessarily mean where it was made but at least the responsible party. I can follow up with Hank if needed.
Does this help?
About the price, it’s considered a budget light because the brands it competes with are much more expensive. It’s also sort of a community design, since it’s heavily based on developments here on BLF over the past few years.
Manuals are available, but they’re also from the community:
Awesome! Thanks.
Regarding TempCheck, how does one use that information? I’ve noticed the light can get pretty darn warm on high and I assume that is normal given how bright it is. So it just made me wonder about that feature and if I should use it and how to interpret what it tells me.
Dang this thing is bright!
In V2 (D4, D1, D1S), TempCheck mostly just shows how far off the MCU sensor is. If it’s at room temperature and it reads out 35 C, it’s probably off by like 15 C. But this doesn’t really matter since the thermal regulation’s temperature limit is set by feel instead of by number.
In V3 (D4S), TempCheck can be used as an actual thermometer, but only after calibrating the sensor.
If this is your most expensive light I’m gonna feel safe assuming it’s also your first hot rod.
Be careful, they burn stuff.
I have some other 18650 lights that can get hot, but this one is the first one requiring unprotected cells. I bought a couple Samsung INR18650-30Q 3000mAh Unprotected Button Top to use as my others cells are all protected.
I can use the Samsung unprotected in my other lights, right? Just not protected ones in the D1, right? For example my Olight S20 Baton or my XinTD C8. The unprotected Samsungs are fine in those, right?
I don’t think the D1 is likely to burn anything. It’s 1300 lumens spread across a relatively wide lens, so it’s not very concentrated. As far as Emisar lights go, it’s relatively tame.
However, the D4 can definitely start fires pretty fast. It’s 3x as much light in 1/3rd as much space.
Soon, UTorch. 
Ya, a 18350 size D4 in your front pocket on high is a terrible thing to experience, especially when your stopped at a traffic light and can’t get the light out of your front pocket thanks to your seat belt and a rather tight pocket, believe me I know,
I still have a red mark where that light had sat on my leg, also the pocket of the jeans has a permanent brown burn mark looking spot,
I still wonder how close I actually came to catching on fire, boy… what a deal that was.
You learn about mechanical lockout immediately, no redo’s … yikes…!
Or maybe you were just lying at the time? 
If “liar, liar, pants on fire” ever becomes an actual law of nature, that’s how you’ll know I have finally ascended.
Didn’t it step down?