TK's Emisar D4 review

Is there a possibility that Hank considers producing a 21700 tube?

I’ve been EDCing my D4 219C lately and the only thing that bothers me is the heat at max level, with LH351D and larger body it should perform pretty amazing. We should persuade Hank to make it into an emitter option.

That is completely fine :+1: I hope it does appear in the mail !
Guess I will have to think of buying my first 26650s :innocent:

3500k 90CRI LH351D (or even in the more traditional 4000k-5000k range) would probably make me buy one, and I don’t even own any 26650s.

Okay, the review unit is here.

I’ll have to thank Hank for sending a black-colored light for photography purposes. Those are always the easiest to get good pictures of. :stuck_out_tongue:

Also, it’s cool white. So I’ll want to swap the emitters. And it has no O-rings, so I’ll probably transfer the rings from the dev prototype. And no label on the tailcap.

So it’s not quite a production unit, but it’s pretty close.

It’s not a production unit, just the production aluminium.

Okay, the D4S review is up:

Nice… look forward to get one .

Awesome review TK, it seems every time I decide to slow down on buying lights along comes one like this D4S that just can’t be ignored,
This light is spectacular and your pictures really confirm that,

Have a wonderful trip.

i cant resist to buy this light…but,i dream about usb version with it…i think,there is someone,who did this mod to mini usb port?

CRX did it:

:beer:

Just got my third D4 today. In “white”. Or light gray perhaps. None the less YAY NEW LIGHT :smiley:

Full album

I can see where the pricedrop comes from. The other two I’ve gotten was cleaner on arrival.
And seemed more precisely made and cleanly cut.
The white one seems a little “Chabuduo”

This looks like it came straight from the mill. No lube on the threads, and tons of milling leftovers.

Five minutes later it’s cleaned, lubed and taken to the workshop for some sanding. P160 grit and now it’s silky smooth.

On a side note; the new white one felt lighter, so i measured them.

(without tailcap, as the older ones has a magnet glued on)
Black XP-G2 S4 5D (V1): 59,28g
Green Nichia 219CT: 59,84g
White Nichia 219CT: 58,08g

But then again, despite all this, at $35 it’s still a friggin steal :beer:

That’s the first thing I noticed also since I was switching batteries to my white one from my blue one. I wonder why that is

P. S. It took two weeks from date of order to my door here in New Jersey USA good work Hank. That makes number 10 or 12 or something got my finger on the button waiting for the D4 S

Would like to add one little thing. Yesterday i wanted to flash another firmware to my new white D4. For some reason the MCU would not read-write. after multiple attempts a tried a Q8 driver, same chip. It read on the first try.
But i could not read write anything to the new d4 driver :cry:

I have a cheap SOIC clip and sometimes need several attempts to make a good connection to the chip.

Are you correctly identifying the position of pin 1? I put a small dot of silver marker on the chip and clip to help me get them positioned correctly.

Pin one is near the triangle symbol on the ATtiny85 in your photo of your other D4 driver from your post in another thread.

FWIW, I’ve flashed five Emisars of various flavors without issue.

I too have flashed the Emisar D4/D1/D1s with no issues. Anduril on each one. :stuck_out_tongue_winking_eye:

Low Voltage Protection? I am sure someone has actually tested LVP.

I gifted my first D4 219c Version 1 to a neighbor and he used it everyday and really liked it.

Well he left it on in his truck the other night and it ran a NCR18650GA down to .5 volts.

I have at least 3 D4’s V2 but usually keep charged between 3.7 and 4.1 or so and have never tested LVP.

I would think the V1’s had low voltage protection but maybe not.

Your thoughts on this. Thanks

I found a couple references to low voltage protection in the OP

Wondering the one you gifted was V1, and perhaps that version did not have it? It looks like several people wrote about experiencing low voltage protection in their D4s.

Failed LVP sounds very strange. I’ve tested it using a bench power supply, and it has always functioned correctly. I also actually managed to run down the battery a couple times and LVP did what it was supposed to. Usually I recharge the cell at about 3.3V, but there have been occasions where I used LVP instead.

I agree strange LVP failed but is there any other way he could run the cell down that low.

I have the light and battery that’s how I measured the .5V.

It’s the only 18650 light he has. Guess if he doesn’t get another battery soon and want it back I can test with 1 of my batteries.

It is definately V1 also.

FWIW, putting the cell in backward can make it do that. I don’t think the reverse-polarity drain was fixed until the D4S.