Beta QRv2 Classic, Mini EDC Keychain Flashlight with Low, Medium, & High Modes (Blue)

If you're not buying this light for its beauty, you can find a better deal elsewhere (lumens per dollar), but you won't find a better blend of form and function anywhere.Pros:Beautiful copper design, if you want it (and if you don't now, you will)High CRI, Nichia 219b emitterBrilliant, well-machined quick-release with a canted coil springEasy, one-handed twisty - great threads, lubrication, and spring tensionNifty glow-in-the-dark material around the emitter beats GITD o-rings (e.g. Worm SS)Good levels for most usesGreat feel, heft in the handCons:Body made in China with occasional, small quality issuesPersonal preference - start level is Low; I prefer Medium for a key-chain lightI've tried a whole bunch of AAA lights including Olight i3s, Astrolux A01, Thrunite Titanium TI3 Neutral White, Fenix LD02, and Lumintop Stainless Steel Worm. I always found myself lusting after the copper beauty that Prometheus had created, and indeed, they all fall short. The Olight i3s is a great buy, but a little cold on color and chintzy on the chain; Astrolux is cheap and had a way-off-center emitter (though they have a Nichia+copper option, I didn't like the design enough); Thrunite TI3 NW is bright, solid, and I like the XP-L V4 emitter pattern, but the color, if warm, was heavily green-tinted (vs the rosier Nichia); the Fenix LD02 is a very cold-blue-colored light with a style I didn't like for a key-chain, including the rear clicky and 'tactical' look.The closest competition is, of course, the Lumintop Worm - I believe that Lumintop is the China-based manufacturer for the Prometheus Beta as well. While I don't have the Nichia+copper version, the battery spring on my 2015 Stainless Steel Worm is too tight to generally operate with one hand. It additionally lacks the quick-release that puts the icing on this Prometheus Beta.As for the bad, my Copper Beta QRv2 has a *slightly* off-center emitter. But seriously, beyond the mental factor for an $80 light, it's completely unnoticeable in the beam pattern. As far as levels, I have a preferential beef. I actually prefer the M/L/H ordering and 5-lumen Low on the Worm vs the L/M/H Beta and its 1-lumen Low. Point - 90% of the time, you turn on a key-chain light needing Medium or High. A firefly-ish, 1-lumen Low is great for saving battery life and night vision in certain circumstances, but it's rarely the level I actually want. I don't take a heavy copper light backpacking. That said, if you are going to have a 1 lumen or less Low, it should be first, so Prometheus got that right, IMHO.A note about that 'copper metal smell' which annoys some - it's not the smell of metal, but the smell of copper ions killing bacteria. Copper is naturally bactericidal and humans are good at smelling death. So, change your mind and embrace the sanitary gleam of copper ;-)All said, I'd buy the Beta QRv2 again for its beautiful mix of design and function. Perfection doesn't exist, but this is as close as anything. Plus, the guy who runs Prometheus is a fantastic U.S. designer and machinist, worthy of some hard-earned dough for a fantastic piece of work.

Really nice and powerful key chain light. First, I love how small it is for the power level. At maximum brightness this thing really puts out some light. Second, I have the copper variation and it is classy and well constructed. Third, it uses AAA form factor batteries. I have used other key chain flashlights that use momentary switches and button cells. The momentary switch would almost always activate the light when I put my key chain in my jeans front pocket and the button cells are not as easily purchased and more money, not to mention you cannot recharge button cells.I ALMOST knocked off a star for ease of use. The light comes with no instructions and is not intuitive as to how to cycle through the power levels. I did immediately intuit this is a twist on/off mechanism but it did not occur to me that you could twist it on/off multiple times to cycle through the power levels. When I first activated the light it was on LOW and my first reaction was...meh, I have had better $1 lights...but once I came back here and read reviews about how to use it I cycled up to full power upon the third twist on/off and WOW talk about powerful. I am just glad for the on-line reviews where this can be figured out! I strongly suggest a small one sided piece of paper to make this clear to folks since you are risking negative reviews by people who are not willing to research.

Prometheus generally makes great lights and accessories. But these are a true gem! I had the black coated version of the QRv2 on my keychain and it is a very nice little light. So when the brass ones were back in stock I ordered one. When it arrived, I almost immediately ordered two more. Which I plan to give as gifts. They are amazing little lights. A perfect blend of form and function. They look awesome and are supremely functional.The quick disconnect system is perfect for a key ring. You can use the light without a huge wad of keys jangling around and I have zero concern that my light is going to detach unintentionally and get lost. The coupling mechanism is in a word, solid.The three brightness levels (featured in the brass and copper models) are all the variability you need in this type of flashlight. I can go from reading in the dark and not blinding myself to enough light to easily navigate my treacherous back steps taking out the trash at night.I really like these lights and I bet you will too!

This flashlight is pretty handy in the dark. Noticeably brighter than a smartphone flashlight, brightest setting is 100 lumens.Keep in mind the beam is narrow, it will cast a decent area of “soft” light but the center that has most of the brightness is smaller than I liked. But it gets the job done that it was meant to do, if you really need more light you can find a good portable flashlight that doesn’t go on your keychain.

I was skeptical paying this much for a AAA keychain light especially since I prefer a clicky button interface to a twisty but I bit the bullet mostly because of the quick release attachment (seriously - why don't more lights at this size that are supposed to be put on a keychain come up with something that will get the light off the keychain quickly?). I was glad I did. The quality on the light is amazing. I'm not sure what they do for the nickel plating but it's been traveling on my keychain for a couple of weeks now and doesn't show any sign of scratching. The quick release mechanism is everything I hoped it would be. So much so, I'm considering buying another of the Prometheus QR attachments for my keys. The threading on the head is so smooth that it's incredibly easy to operate the twist on the head one-handed relieving any fears I had about not having a clicky interface. The quality of the light is also top notch. It's not the brightest light out there at the AAA size but the quality of the light it makes is second to none. Overall I'm really happy with this little light.