NTG35 LEDs are recommended for good tint, beam pattern, high CRI and free of greenish tint.
Emisar D4K puts a high lumen output but generates a lot of heat at the same time, please acknowledge before purchasing. Unprotected, flat top battery works only (not included in the price), D4K does not work with protected battery.
The Lume X1 boost driver upgrade is available for the Luminous SST-20, SFT-25R, Nichia 219B R9080, Nichia 519A R9080, NTG35 LEDs etc, 3 Amps per LED. The boost driver is not compatible with Nichia E21A, Nichia E17A or the mule versions of the flashlight. Note that the boost driver output is limited in comparison to the default driver, it is more efficient (90-95%) with a longer running time and less heat.
The Lume X1 is a high power driver - for best performance, recommended to use low ESR, high CDR 21700 batteries such as Molicel P42A, P45B, Samsung 50S, 40T, or Vapcell T50. Please note that this flashlight is not a toy and must be operated responsibly.
Features:
• CNC machined from aircraft-grade aluminium
• High end custom made N244M optic installed by default.
• Unihead construction
• High lumen output and low moon output
• Ramping interface
• Electronic soft touch switch
• 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)
• Weight:58g
• Dimensions: 103mm(length) * 28mm(head) * 26.5mm(body)
OTF lumen output at start-up for Lume X1 driver:
NTG35 5000K/4200K: 2900lm OTF / 12,800cd
NTG35 2700K: 2500lm OTF / 10,200CD
NTG35 1800K: 2000lm OTF 7,100cd
519A 5700K/5000K DOMED: 2600lm OTF / 8,200cd
519A 4500K/4000K DOMED: 2400lm OTF / 7,200cd
519A 3500K/2700K DOMED: 2200lm OTF / 6,100cd
519A 1800K: 2000lm OTF / 3,800cd
519A 5700K/5000K DEDOMED(about 1300K CCT reduce): 2300lm OTF / 11,000cd
519A 4500K/4000K DEDOMED (about 1200K CCT reduce): 2100lm OTF / 9,300cd
519A 3500K/2700K DEDOMED (about 1200K CCT reduce): 1800lm OTF / 6,200cd
SST-20 6500K: 3200lm OTF / 15,200cd
SFT-25R 6500K/5000K: 3600lm / 20,800cd
OTF Lumen output at start up for Linear + FET driver
NTG35 5000K/4200K: 4200lm OTF / 17,100cd
NTG35 2700K: 3600lm OTF / 12,800cd
NTG35 1800K: 2800lm OTF / 9,200cd
519A 5700K/5000K : 3800lm OTF / 8,900cd
519A 4500K/4000K: 3500lm OTF / 7,500cd
519A 3500K/2700K: 3200lm OTF / 6,200cd
519A 1800K: 2600lm OTF / 4,500cd
519A 5700K/5000K DEDOMED(about 1300K CCT reduce): 2600lm OTF / 13,000cd
519A 4500K/4000K DEDOMED (about 1200K CCT reduce): 2300lm OTF / 12,300cd
519A 3500K/2700K DEDOMED (about 1200K CCT reduce): 1900lm OTF / 8,200cd
SST-20 6500K: 4200lm OTF / 17,600cd
SFT-25R 6500K/5000K: 4800lm / 25,600cd
This product uses free software of Anduril 2, distributed under the terms of the GPLv3.
Source code is available from https://toykeeper.net/anduril
D4K with SS (polished silver, black PVD coating, bronze PVD coating) parts upgrade
Customer Reviews
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Dmitrii P
Just great EDC light August 31, 2025
I bought 2 D4K with 519A 1800K&5000K, metal button, SS bezel, magnet in tailcap and Lume X1 in white and dark grey colors. They are just awesome. Great for home and outdoor, ideal ergonomics and functionality. I recommend everyone this lights. Thank you, Hank!
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Hammy
Excellent torch April 14, 2025
This is my 1st hanklight, and I'm not disappointed. Build quality is solid, and in comparison to my other 21700 torches it's tiny...bought mine in black with quad sst20 dr let's and it's an absolute light cannon...many thanks hank, I will be back for more
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Kenny G
Love it February 4, 2024
Started collecting knives and pens and now flashlights. Already have a few other brands but have just unboxed my first Hank Light and wow- it won’t be my last (already have 2 more ordered)
I used to scratch my head at the SOTC posts that would seemingly be a dozen different specifications of THE SAME LIGHT but I feel this might be me soon with the D4K… -
Adam
Small, elegant and fun. December 26, 2023
Ordered mine in black, cool white switch. Quite elegant light, fits good with my PC on the desk. The fact it uses 21700 makes it last quite long. It's funny seeing people surprised that such a small flashlight can emit so much light. Best 50 bucks I've spent on an everyday item.
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Toast
D4K July 6, 2023
I got a D4K mule with 2700k and 4000k 519a dedome with the intention of using it as a indoor light. Its quickly become my favorite light, the tint is very nice. Hank also provides customer service thats hard to beat.
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Colin B.
Awesome pocket light April 26, 2023
I got mine in Grey, with Amber switch, and 519a 4500k with domes, with the boost driver, and clear optics installed. The beam is just beautifully smooth and clean, even holding it a few inches from a white wall I don't notice any artifacts. The 519a emitters are fantastic, renders color almost as well as The Big Emitter in the Sky. This is the perfect light for close to medium distance tasks at any hour. At night, turbo can light up a decently large area, but I would choose something bigger with more throw for dedicated outdoor use in wide-open spaces. Overall I couldn't be happier, it will live in my pocket for many years.
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Product Questions
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