JKK76 7*SFT40 and 7*SFN55.2

” Some chips”:Jkk76 - Album on Imgur

I took apart the battery tail screws and found these mosfet chips but I think some desoldering is involved in finding the driver on the head.

Sorry if this picture don’t come through. I’m still somewhat new to the forums formating

Really? Are the ultra budget priced, high powered flashlight threads now getting spammed for CRI too? Did you hit the new Nightwatch NS59v1 thread too for not having high CRI? Or is it just because this one is 3000k and people shouldn't be able to get excited for Warm White unless it's also ultra super high R9 99CRI+? I'll contain my excitement next time.

and to further your point- I could easily mod the mk38 with 90CRI 70.3 HI LEDS, would be no problem have it done in under an hour- if I was able to spend $350 on the mk38 from manker's site and ANOTHER 7 x $13.80 = $96+ For (7) LEDs from Kaidoman.com or mouser. So... $446 for a mk38 so I can have HI CRI (and yes a boost driver i know, and it's better made) or $92 for 3000k , 25,000+ lumens without hi Cri. I think at >25,000lumens I'll be able to distinguish a stick from a snake and save myself $300+

also, I've owned the mk38, it's awesome. But it doesn't make the jkk not awesome either.

8 x $13.8 :wink:

So just to put it into perspective, the jkk76 with the sfn55.2 can it be moded to 7x xhp70.3 for that hi-cri floody throw? Both of these emitters are 7070 but the xhp70.3 are 6v and the sfns are 3v.

No, but you could probably drop in an SFQ60 warmwhite high cri
SFQ60 7070 LED

Beamshots

Stumble upon this JKK76 today on KD, got interested in it and then discovered this discussion thread. Thanks for the sharing 2100, apparently it is a winner especially at this price. I am kinda concerned about the heat issue here tho because as I read one of the reviews of Nightwatch NS59v1 which runs 9*SFQ55 emitters at the end of the reviewer’s test one of the emitters got some sort of burn mark on it. Maybe it’s true as you and other BLFers mentioned that while these Chinese LEDs offer great value in the lumens department, they are relatively inefficient as compared with CREE LEDs, so at high current as this there could be reliability issue. But if it’s as what you tested, that Jinheng has somehow limited the current draw in its driver then maybe I could give it a shot.

Apart from that, 150kcd should translate itself into 775m of ANSI beam distance, not sure why they mentioned 450m on their page tho. Anyway if you measure 120~130kcd in your case then it is around 700m in ANSI which is still pretty impressive, not that you can actually see things at 700m in practicality given such an enormous amount of lumens but still, it is mind boggling in perspective. 26k lumens with 700m of beam distance at such a price, it’s really not bad of a deal afterall.

Edit: I still have my two units of BTU Shocker with me, one modded by myself with dedomed XM-L2 + DRY driver back then and another one still in stock form. They are still rocking!

This light still tempts me. I just can’t get into the super bright but not too efficient SFN55.2 LED’s.

It’s super tempting so I just went with the sft40s instead. It’s a mk38 on 1/3 the budget, you get more throw at the cost of a half the lumens but it’s only precieved brightness.

From 1Lumens Nightwatch NS73v1 review I calculated the output to be 4131 OTF lumens for 13,7A. Divide those amps by two and we are near the 6V XHP70.2 territory. Not too inefficient in my opinion.

The Chinese Leds are actually quite efficient at low currents. However, they can take ridiculously high currents and therefore become inefficient at those levels. You can just choose to not drive them so hard. Other Leds such as Nichia Leds will just blow at higher currents.

Hi all

I just got the NS73V2 and I am using a Samsung 30t but would be the difference in terms of output and max lumens if I used the Lishen 21700hp battery?
I am trying to get it from Neal but I have to buy another light first which I don’t want to!

What is the recommended battery for this light?

Thanks

Samsung 30t will give you the max lumens.

Cool thanks for letting me know

I don't know if it was discussed further, but I finally got an Opple after receiving this light. The JKK76 with 3000k option is in fact 95CRI.

i already sold my light, just bc I'm obnoxiously sporadic in selling things, but the day I packaged it up I realized I never tested it. And it was in fact Hi CRI.

that would've probably stopped me from selling it had I tested it before I was paid for the sale lol.

Anyway, the 3000k JKK76 is a MARVELOUS light for under $100.

FYI. If you go to Kaidomain and type in Jin Heng or JKK. it does not show the JKK76. But, if you type in JKK76 it does show and can be added to a cart.
Go figure…… :slight_smile:

Is it possible to go down in brightness without cycling upwards through all the levels?

My measurements from TA lumen tube and Opple III/Pro, of a different JKK model but shows the excellent current limit of the Nealsgadgets battery. Capacity only 2800 mAh though. HERE:
NIGHTWATCH CHAOS
Output:
Nealsgadgets “Mystery” Lishen “LR2170HP”: 29300 lm.
Samsung 30T 25800
Samsung 40T 22900
Molicel P42a 22600
Convoy Liitokala 19300
Wurkkos 5000 mAh 18800

Other numbers:
Ra 67
CCT 5808 Turbo, 5736 Turbo-1, 5529 Turbo-2, 5507 T-3, 5479 T-4
Duv 0.0047 Turbo, 0.0064 Turbo-1, 0.0093 Turbo-2, 0.0097 T-3, 0.0100 T-4
CCT increases and Duv decrease with higher output.

Of note Nightwatch Chaos comes with green-reflection AR lens, which surely helps with the tint.

1 Thank

For JKK76

JIN HENG JKK76
Output: 20400 lm w/ Samsung 30T
Throw: 773 m
Ra: 68
CCT: 6100 Turbo, 5808 Turbo-1, 5755 Turbo-2
Duv: 0.0060 Turbo, 0.0087 Turbo –1, 0.0094 Turbo-2
CCT increases and Duv decreases with higher output.

JKK76 comes with purple reflection AR lens.