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If you only have one flashlight, make it a Quark
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Foursevens Quark MKIII LED Flashlight: The Legacy Continues

$89,606

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The Foursevens Quark MKIII is a true everyday carry flashlight – If you only have one flashlight, it should be a Quark. 

The new MKIII's are powerful, configurable, reliable, and ergonomically on point: the result of a combined two decades of flashlight design and production experience. The Quark is specifically designed to cover 80% of your everyday illumination needs: the right tool for the job. Here are the highlights. 

Two new models: 

  •  Quark QK2A: The Generalist - 500 Lumens max (2xAA NiMh rechargeable batteries)   
  •  Quark QK16L: The Enthusiast - 700 Lumens max (16650 Li-Ion rechargeable battery) 

New and Improved: 

Please see the "Performance & Specifications" section near the bottom for more technical information!  

  •  Industry-leading LED: The MKIII features the newest Nichia 319A with 5000K color temperature and 80+ CRI. It's meant to strike the perfect balance between crisp white beam quality and maximum output.   
  •  Configurable interface: No one can agree on the best program setup so we offer 6 convenient program presets (configurations). Choose your favorite, at any time. The configurable user interface that is being standardized across the entire Foursevens line. No matter what light you pick up, you'll know exactly how to use it. 
  •  Burst mode: Using a very fast double press, burst mode (100%) output is directly accessible from any previous level, and reverts to the last saved mode. Experts agree that most flashlights are used at lower level outputs, but sometimes you need to dial it up. We've got you covered on both counts.  
  •  More beef: For when gravity strikes, and it always does. The diameter of the entire light is *very* slightly larger to improve mechanical reliability and impact resistance because durability + reliability = longevity.  Built for life.
  •  The best pocket clips on the market period: Pocket clips are my jam because I obsess about every detail, because every detail matters. Our new clip is made from thicker material, providing easier pocketing and improved grip. Most of the "grip" on a flashlight comes from the pocket clip, not the surface finish. 
  •  Tailstand cap (if you know, you know.):  All Quarks ship with the traditional forward (momentary) clicky switch that stands proud of the tail. For those who prefer a recessed button and a light that can tailstand, we also include the all new snap-on Quark Tailstand Cap.  
  •  Hybrid Memory: A blend of memory and no-memory, the hybrid configuration saves the last mode used, but reverts to the first mode in the sequence when shifting out of a saved mode.     
  •  Solid Copper (Direct Thermal) MCPCB: The LED is mounted to a solid copper PCB to provide superior thermal performance and maximum output -- a first for the Quark. 

Prometheus acquired the Foursevens brand in early 2018, and we have been working all year on a bunch of new lights. We already launched the Preon MKIII and the Mini MKIII lights, but I'm here today and I'm excited to show you the latest version of the Foursevens flagship flashlight, the Quark MKIII. Prometheus has run 6 successful Kickstarter campaigns, but this is our first project under the Foursevens banner. Welcome aboard!

Foursevens has long been a leader in the LED flashlight industry. In fact, it's one of the brands that started it. Over the last decade Foursevens has become known for reliability, usability, and pushing the limits of modern technology. The Quark line is one of the best general purpose flashlights ever made. Don't take my word for it. Go ahead, Google it, it's a legend. 

The original Quark was one of the first commercially produced "high output" LED flashlights on the market. When the Quark hit the scene in 2009, it completely shattered the mold and ushered in the era of modern EDC (Every Day Carry) flashlights. It put the Foursevens brand (and founder David Chow) on the map as an innovation leader in the world of EDC gear and spawned a new flashlight form factor that other manufacturers were quick to imitate. 

The first of many Quark iterations: circa 2009
The first of many Quark iterations: circa 2009

Since then, the Quark has continuously evolved and the MKIII is intended to continue that legacy. I like to think the Quark is the Porsche 911 of flashlights: some things are so good they don’t need to be re-invented, they just need to be refined. 

When I took over the Foursevens brand from David in 2018, this Quark project quickly became all-consuming. How could I take my 10 years of experience designing high-end custom flashlights and combine them with the decade David spent reiterating and refining the brand’s flagship?  

Passing the torch (left: Jason Hui)(right: David Chow)
Passing the torch (left: Jason Hui)(right: David Chow)

It was a huge responsibility to take something so good and improve upon it, but that’s just what we’ve done. The next generation Quark is the best yet, and I’m thrilled to have the opportunity to get one into your hands.

I have a very specific approach to flashlight design: balance, reliability, longevity, and usability. My goal with revamping the Foursevens line was to keep the core principles while sprinkling "Prometheus dust" into the mix. Prometheus has never made "race car" lights (nor has Foursevens) that put out absurd lumens at the expense of reliability and user safety. This is one place where Prometheus and Foursevens are perfectly aligned - We make tools, not toys!   

Anyone who can't see in the dark. Does that describe you? Kidding...not kidding. A flashlight is a humble thing -- but only in the context of our technological age.  When you stop to think about it, the ability to turn night into day is a superpower. Ask any cave man. Despite its omnipresence, we still find ourselves in situations where technology – and light – doesn't reach.  We turn in those moments to the humble flashlight. A tool for a job, for your adventures, for the home, and for personal safety.  

So you have a smart phone (with a light) and/or a headlamp? That's fine. Different tools for different jobs, but they don't replace the role of a flashlight. 

The problem with smart phones: the light is very weak and it consumes a huge amount of battery. So you spent all your battery power on making light...what about making that call? Ohhhh, right. 

Headlamps are great. I love them. I have several. But the reason the flashlight has endured the test of time is because it's the perfect form factor for the unknown. You don't know when you'll need light, but it will be in your pocket or bag when you need it. Where's your headlamp? Probably the same place as mine, in a drawer at home.  

What's new? 

  •  Nichia 319A LED: The perfect balance of power and beam quality - We have selected a 5000K color temperature with 80+ CRI (Color Rendering Index) to provide a balance of crisp white beam, CRI, and maximum output. One of the newest LEDs on the market, it offers a balance of high power and Nichia's legendary color rendering, delivered via a unique hexagon shaped LED die. Most LEDs are square, but Nichia designed the hex-die specifically to deliver more uniform color and beam pattern when paired with a reflector. 

The 319A also has much less color distortion from the center of the beam to the edge (see below). A lot of LEDs will give you very bad "tint shift": the center of the beam is generally white, but then you get a gross yellow/green and then purple/blue bands the farther you get from the center (see below). This is just the physics of optics, but the 319A is specifically designed to minimize that distortion and provide the most uniform color over the width of the entire beam. Once you try it you'll never go back. 

  •  80+ Color Rendering Index (CRI): Meets the ANSI indoor lighting standard - CRI is the scientific measure of how accurately a light source reproduces colors compared to sunlight. I'm obsessed with beam quality, and accurate color rendering is an absolute must. The Nichia 319A we selected has 80+ CRI, which is the ANSI (American National Standards Institute) standard for indoor lighting. I normally prefer even higher CRI, but to get higher CRI you have to sacrifice brightness. We chose this specific LED because it's the highest brightness available while maintaining a minimum of 80 CRI. Balance, remember? LED selection is absolutely the easiest place to skimp on cost (better LEDs cost more) and "cheap" LED lights tend to have CRI at or below 65. Poor CRI is exactly why everyone used to hate fluorescent bulbs. 
  •  Configurable user interface: We let you personalize your light - Foursevens was one of the pioneers of the user-configurable interface. This means you can choose from 6 different program presets at your convenience. Everyone uses lights differently and we've used our decade of experience in flashlight UI to provide options to cover a wide variety of use cases. You can set it up for simple on/off operation, or you can set up what I call the "toolbox" with 3 levels of brightness, burst, strobe, SOS, and beacon mode. This is the first time a configurable interface has been offered in the Quark platform. This UI is also being rolled out across the entire Foursevns product line, so no matter which light you pick up you'll know exactly how to use it. Check out the video below and learn how to configure your Foursevens light. Specific configurations are listed under the "Performance & Specifications" section further down the page. 
  •  Burst Mode: Saves battery but gives you power when you want it - All new Foursevens lights feature "burst" mode: a fast double press will allow you to access 100% output at any time, from any previous level. You get full power for 30 seconds, and then the light ramps down smoothly and imperceptibly to high mode over the next 30 seconds. High mode is 60% output, and this is largely a battery saving feature, not a thermal management feature. Your eyes perceive this as only a single "step" in brightness. So running on full power is (usually) just a waste of battery. However, if you really do need 100% power...it's available any time.  
  •  More robust mechanical design: Built for life - You won't notice, but we did. During torture testing we discovered that multiple (severe) impacts to the head of the light could cause the glass to crack, so we beefed up the diameter of the head (and the entire light) to better absorb this abuse and improve long term durability. This doesn't make it indestructable; however, we believe this small change will mean the Quark can better handle whatever your life has to throw at it.  
  •  Ergonomics: No detail escapes our obsession - The pocket clip is one of the most important ergonomic features of an EDC flashlight. It also contributes more to the feeling of "grip" than the body shape or texture. This is a little weird, but Prometheus is known for making the best pocket clips in the game. I've taken my decade of experience and customer feedback and made the Quark clip a functional piece of art. The shape makes pocketing effortless, it holds securely, and adds additional grip to the light for a perfect fit in hand. We are also offering the traditional "deep carry" clip in black as an accessory, for those who prefer a light that rides very low in the pocket.  

  •  Tailstand Cap: It used to be complicated, but now it's not - Everyone has different preferences and the tailstand cap allows you to choose yours. The standard proud tailcap allows easiest access to the tailcap button, but because the button is proud, you can't tailstand the Quark to light up a room. In the past you had to disassemble the tail of the light and swap in a new switch and button if you wanted the light to tailstand. Now all you have to do is snap on the new tailstand cap, which is backwards compatible with all Quarks ever made. When I said longevity I wasn't kidding.   
  •  Solid Copper (Direct Thermal) MCPCB: This stands for Metal Core Printed Circuit Board and serves as the mounting base for the LED. This technology is only seen in the highest end lights (because it's expensive) and Prometheus was the first company to adopt this technology to production flashlights many years ago. Direct Thermal means the LED is soldered directly to the copper substrate for maximum heat dissipation. Our MCPCBs transfer heat 77x better than traditional designs found in lesser flashlights. Removing this heat allows your light to maintain maximum output instead of constantly falling output due to overheating the LED. An overheated LED will die long before it hits its 10,000 hour life span. Major enginerding here, but that's the job. This is one place many manufacturers skimp on cost because they don't think you'll know the difference, but now you do. 
  •  DIY Friendly: So you want to mess with our lights? Go ahead - *Warning...more nerd content* Unlike most industries, flashlights have been driven by the little guys (individual makers and modders working at home); people who love tinkering with technology. We intend to honor that tradition. Most manufacturers (including Foursevens in the past) glued or thread locked certain components so they cannot be disassembled without a lot of effort and/or destroying the light. No more. I say tinker on my friends!  Yeah, it will void your warranty, but you know how to take things apart, fix them, and put them back together. You've got this. 

What's not new? 

  •  Backwards compatibility: The new Quarks are fully backwards compatible with all Quarks ever made. This is one of the most beloved features of the Quark, and it's here to stay. Eventually we plan to roll out a single AA light and a 16340 sized lithium light (1/2 the length of the 16650 battery). As in the past, all parts are interchangeable, but now each head (containing the LED driver board) is dedicated to a specific battery chemistry/voltage range. This means the "A" series heads work with either 1 or 2 AA batteries and the "L" heads work with either 1 or 2 lithium batteries.  
  •  Form Factor: Quarks are relatively small lights and the MKIII maintains an identical form factor to their predecessors. They are intended to be compact enough to carry easily, but large enough to have good ergonomics, reasonable battery capacity, and deliver significant power. The QK2A is a little longer and better suited to deeper pockets. The QK16L is shorter and should work in almost any pocket. 
  •  Appearance: You might be wondering why the Quark looks a lot like other modern flashlights, and that's because modern lights look a lot like their granddaddy Quark. I could have changed the appearance, but then it wouldn't really be a Quark!  

Both Prometheus and Foursevens have a long history of accurate reporting. In other words, we aren't feeding you a line of bull about what the lights are capable of. All lumen ratings are OTF (Out The Front) lumens; not calculated, estimated, or just plain old "made up to impress people that don't know better" lumens. Some companies will tell you anything to sell lights. For example, I just bought/tested some LED headlamps for my car rated at 5000 lumens. The real output? About 1000 lumens. Busted. 

Our lights are tested in a laboratory-grade integrating sphere calibrated with a NIST Certified FFS (Forward Flux Standard). A FFS is basically a fancy $5,000 reference lamp that is used to calibrate a lumen measuring sphere. As far as I know, we are the ONLY small manufacturer to use a NIST Certified calibration standard. I mean, who is crazy enough to buy a $5,000 light that gets used 4 times a year? Yep, me. Please see the images below for the performance/specs listed on the final product label.   

Foursevens Quark QK16L Details (below)

Dual battery warning: While the QK16L is capable of being powered by 2xCR123 (lithium disposable) or 2xRCR123 (li-ion rechargeable) batteries, we do not recommend their use. Using two lithium cells in series (end to end) can be dangerous because a fault in one battery can cause the other battery to potentially catch fire and explode. This is why we ship the light with a single li-ion cell. 

 Quark MKIII QK16L (link to PDF instruction manual) 

  •  Dimensions:  
                             Length: 4.5 inches
                             Diameter: 0.88 inches
                             Weight (with batteries): 3.2 oz 
  •  LED Emitter: Nichia 319A (5000K / 80+ CRI)
  •  Voltage range: 2.8V-8.4V
  •  Driver Type: Constant Current
  •  Beam Distance: 170m
  •  Brightness Levels:
                             Low (Moonlight): 1 lumens, 270 hrs
                             Medium: 100 lumens, 9.5 hrs
                             High 400 lumens 1.75 hrs
                             Max/Burst 700 lumens, 1.5 hrs 
  •  Special Modes: Strobe (20Hz), Beacon, SOS
  •  Reflector: Textured
  •  Switch: Forward Clicky (momentary) 
  •  Body Material: Type-III hard-anodized 6061-T6 aluminum
  •  Lens Material: Optical-grade glass lens with anti-reflective coating on both sides
  •  Water Resistance: IP68
  •  Included Accessories: 16650 Li-Ion rechargeable battery, spare o-rings, Tailstand Cap
  •  Where it's Made: China

Foursevens Quark QK2A Details (below)

Alkaline battery warning: While the QK2A is capable of being powered by alkaline batteries we do not recommend using them. Alkaline batteries are not designed for high-output devices and will leak or release corrosive gas during discharge. This will ruin your light and void your warranty.  

Quark MKIII QK2A (link to PDF instruction manual)

  •  Dimensions:  
                             Length: 5.8 inches
                             Diameter: 0.88 inches
                             Weight (with batteries): 4.2 oz 
  •  LED Emitter: Nichia 319A (5000K / 80+ CRI)
  •  Voltage range: 0.9V-3.0V
  •  Driver Type: Constant Current
  •  Beam Distance: 145m
  •  Brightness Levels:
                             Low (Moonlight): 1.5 lumens, 210 hrs
                             Medium: 80 lumens, 8 hrs
                             High 300 lumens 1.5 hrs
                             Max/Burst 500 lumens, 1.25 hrs 
  •  Special Modes: Strobe (20Hz), Beacon, SOS
  •  Reflector: Textured
  •   Switch: Forward Clicky (momentary) 
  •  Body Material: Type-III hard-anodized 6061-T6 aluminum
  •  Lens Material: Optical-grade glass lens with anti-reflective coating on both sides
  •  Water Resistance: IP68
  •  Included Accessories: 2xAA NiMh rechargeable batteries, spare o-rings, Tailstand Cap
  •  Where it's Made: China

Choose from 6 different preset software configurations:

All Foursevens lights ship with Config. 3 as the default. 

  • Config. 1: High - (Burst 100%)
  • Config. 2: Max (100%) - Strobe
  • Config. 3: Medium - High - (Burst) (Default Configuration) 
  • Config. 4: Low - Medium - High - (Burst)
  • Config. 5: High - Medium - Low - (Burst)
  • Config. 6: Low - Med - High - Strobe - SOS - Beacon - (Burst)  

!!! All lights come with RECHARGEABLE batteries included !!!

If you don't already own a charger you can bundle one! You'll also be able to add additional discounted batteries and chargers via Backerkit after the campaign closes.  

The Flex Charger attaches via magnets and can charge any single cell rechargeable battery: Li-ion or NiMh. It can automatically detect battery polarity/chemistry and will not short circuit.
The Flex Charger attaches via magnets and can charge any single cell rechargeable battery: Li-ion or NiMh. It can automatically detect battery polarity/chemistry and will not short circuit.
The Overnight wall charger has a 120V (US ONLY) wall plug and batteries should be removed after 12 hours. This basic charger does NOT have automatic shut off, so don't leave them on the charger for more than 12 hours.
The Overnight wall charger has a 120V (US ONLY) wall plug and batteries should be removed after 12 hours. This basic charger does NOT have automatic shut off, so don't leave them on the charger for more than 12 hours.
(Available via BackerKit after the campaign closes) The USB smart charger can be plugged into any USB port for power. This is a Smart charger and will stop charging the batteries when they are full. International customers should wait for this option.
(Available via BackerKit after the campaign closes) The USB smart charger can be plugged into any USB port for power. This is a Smart charger and will stop charging the batteries when they are full. International customers should wait for this option.

 All foursevens lights ship with rechargeable batteries included:

We are on a serious mission to stamp out disposable batteries because they are a scam and they don't work well. It's 2019 and disposables are dead...at least they should be. Modern rechargeable batteries deliver more power, last longer, won't leak, and will start saving you money in as little as 3 charges. Just like with razor blades, the big corporations want you to keep throwing your hard earned money away. 

Alkaline battery warning: Alkaline batteries leak and release corrosive gas during normal discharge. I guarantee they will eventually ruin your light. Battery damage is (by far) the #1 cause of flashlight failure. They also lose output power over their entire life, but rechargeables maintain full power for almost the entire charge. Standard alkaline batteries will power the Quark QK2A, but we don't recommend using them because of the issues above. 

The best thing is, you can switch all of your household battery usage to rechargeable. It's been over 5 years since I wasted money on alkaline batteries and I feel like I'm beating the system every time I charge them up. 

Recharge early and often: Using rechargeable batteries means your devices can be at full power all the time. Modern rechargeables don't have memory and you can charge them as often as you'd like. In fact, they will last much longer if you don't let them go dead before you recharge. We've been trained by disposables to draw out every last drop of energy, but that's not how rechargeable batteries are meant to be used. How often should you recharge? If you wonder if they are charged or not...charge them. If you know you are going to use your light...charge them. 

Batteries for emergency use: There is a widely promoted fallacy that disposables are better in an emergency.  They are not. Preparedness is about self sufficiency. Relying on disposable batteries is about being dependent on supply, whether that is at home or in a store. 

Example: There is a big storm coming and you want to be sure you have batteries. That's a good move, but what do you do when you get to the store and all the batteries are sold out? If you have rechargeables, you can sit comfortably at home and top them all off while watching Netflix instead of fighting people at the checkout line. 

Example: You have a stockpile of alkaline batteries in a drawer. People like to say that the long storage life of disposables make them better for emergency preparedness. I wholeheartedly disagree. First, if you are relying on something you left in a drawer for 5-10 years then you really aren't prepared. If you have a handful of rechargeables that you use regularly, you know for sure that they are good to go. Second, modern rechargeables will retain 70-80% of their charge after one year. Items used for emergency preparedness should be inspected and maintained annually. 

How many batteries do you need?: My rule of thumb is to have 30% more batteries on hand than what you presently have installed in your devices. That way you don't have to wait for batteries to charge if you need new ones. Just swap in the new and recharge the ones you removed. For our household I have about two dozen AA and AAA NiMh batteries. For my Li-Ion powered lights I always have one in the light and one spare. 

Don't believe the hype. There are a lot of flashlight companies (mostly no-name brands) that are completely lying to you. Hype sells, but we just don't do it. Seems like 20K lumens is the most popular "made up" eBay number these days, though I really did find one claiming 200K lumens. You'd need an Arc Reactor to power that...so only possible in the Marvel Universe. 

Anybody can make a bright flashlight these days, but making a flashlight into a functional tool is about more than lumens. It has to do everything well – and that is exactly what the new Quark is designed to do.

If you are new to high-output lights, either Quark is going to leave you speechless the first time you fire it up in true darkness. (Actually, in my experience, most people curse.) If you are a flashlight pro, you know that most of the time you are going to use the lowest modes anyway, not the highest. 

The Quark is an 80% light, meaning that it's designed to cover 80% of normal flashlight use. Sure, we could have "over powered" the Quark, but that doesn't make sense. The simple fact is (from an engineering perspective) power = heat. If you don't have enough thermal mass in a light to remove that heat from the LED then you damage the LED, risk burning things, and you start losing output from the moment the light is turned on. That's cool if you just want to impress your friends, but it's still bad design and engineering. Both Quarks are engineered to run at full power without becoming dangerously hot to yourself, your belongings, or the internal components.  

Here's the truth TL:DR (science ahead):

Please see the FAQ where we bust some flashlight myths! I also discuss topics like the science of brightness, how your eyes perceive brightness, and flashlight best practices. 

Risks and challenges

This is our 7th Kickstarter (6 under Prometheus Lights and our first under Foursevens) so I don't expect any significant problems. We have reviewed final samples and are a go for full production. Right now the main risks are major issues like the shipment being lost at sea or something crazy. The other risks are part shortages on items with long lead times like batteries and LEDs. We currently have a lot in-hand, but if the project is significantly over-funded this may cause some delays with final deliveries, but not initial deliveries.

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Environmental commitments

Visit our Environmental Resources Center to learn how Kickstarter encourages sustainable practices.

Long-lasting design

One of my core design philosophies is "design for repair and disassembly." We do our best to build the most robust products possible, but things break. That's just life. The new Quarks are designed to last a lifetime, but in case they don't, they are also easy to repair and backed by our Limited Lifetime Warranty.

Something else

Prometheus ships all flashlights with rechargeable batteries included. In this modern age, there really isn't any reason to keep using disposables...unless you like wasting money...which we can't help with ;)

Questions about this project? Check out the FAQ

Support

  1. Select this reward

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    QK2A

    500 Lumens with 2xAA NiMh batteries (included).

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    Retail price $70.00

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    QK2A+ 120V Wall Charger + 4xAA Batteries

    500 Lumens with 2xAA NiMh batteries (included) plus a GP 120V Overnight Wall Charger (USA only) with 4xAA batteries.

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    Retail price: Light $70 + Charger $15 = $85

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    QK16L

    700 Lumens with a 16650 lithium ion battery (included).

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    QK16L + Flex Charger

    700 Lumens with a 16650 lithium ion battery (included) plus a Foursevens Flex Charger.

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    I can't decide so one of each!

    1 QK16L + 1 QK2A (batteries included)

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    Retail Price: QK16L $80 + QK2A $70 = $150

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    QK2A (EarlyBird)

    500 Lumens with 2xAA NiMh batteries (included).

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    QK16L (EarlyBird)

    700 Lumens with a 16650 lithium ion battery (included).

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Funding period

- (21 days)