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- Mar 26, 2004
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(Incidentally, I also carry a Rovyvon Aurora A8X on a keychain. It's the Nichia/red/white/UV model, so I don't need a separate UV light. I find myself using the red LED quite a bit too. Quite bright for such a small red LED.)
I've got the same one, as well as the A5x with the green glowing body. I should come up with some quick detach system for my keychain for when I want to slim things down, since the A8X UV really does replace 3 different lights (adequately, although not as well). I honestly probably don't need the Sofirn SC01, but it's so tiny and nice to use that I like having it regardless. The low is great for getting around without blinding myself, and the high is impressively bright for being so small. The fact that low-to-high just requires you to twist it more (rather than the annoying on-off-on method of mode changing) makes it even better.
Incidentally, if you didn't know, Rovyvon, Nitecore, and Jetbeam are all part of the same company, which is why there's so many different of these keychain lights (Nitecore TIKI, Rovyvon Aurora, Jetbeam Mini) that seem almost identical. Great family of lights regardless. The amount of light they put out for their size is crazy, especially when you remember that it was just a (seemingly) few years ago that LEDs were barely matching the output of smaller Surefire incandescent flashlights. There's almost no reason not to have one on your keychain.
BTW, I was disappointed that my old A5x stopped working after less than a year. But they have a 2 year warranty, and after emailing them a screenshot of my order and a quick video of it blinking oddly, they sent me a brand new one in 2 days(!) via Amazon.
I did also try another lookalike by Astrolux because they offer one with a 4000K 95+CRI SST20. It's not great. The USB cover is large and sticks out, meaning it'll likely pop out in your pocket. It turns on with a single press, meaning it's very easy to accidentally turn it on in your pocket, and most annoyingly, a double click from off (which turns on all the other ones) goes directly to a max-level strobe. A shame, because otherwise it'd be great - it has a smooth ramping interface (press and hold to brighter/dimmer) with a very low moonlight low, and it's the only one of this style I've found with a warm/neutral high CRI LED. The Nichia 219C Rovyvon is pretty good, but it could be better with a warmer bin or a Luminus SST20. It does have a lockout mode, but it takes 5 clicks and flashes a bunch (white, red, blue, like a cop car) and just isn't practical.
For clarification, in my first post I said the Rovyvon A8x had a 5000K 92CRI LED, but their website says it's a 4500K 90+CRI LED. I don't know that I believe it though. I have a 5000K Cree XP-L Hi FW3A and it's warmer than the Rovyvon. The side light is also advertised as being 4500K, but I'm sure you'll agree that it's warmer than the front light. The front light on the Rovyvon does, to my eyes, have better CRI than the 5000K Cree, despite the whiter tint. It's not as good as my 4000K 219C Jetbeam RRT01 or my SST20 lights, but it's definitely not the harsh white 6000 or 6500K that is the XP-G3 of the 650 lumen A5x. The discrepancy in perceived tints might be a result of the optics (TIR as opposed to reflector or bare), or they might actually be 5000K 90+CRI LEDs. I'm thinking that it's the optics creating different tints - this is a known phenomenon that crops up when people compare lights with different optics but same LEDs, such as Convoy S2 vs Lumintop FW3A (reflector vs TIR).
Anyway, S Seth Green the Lumintop FW3EL might interest you. It's essentially a FW3A that's modified for simplicity. It's only sold in one place (can't mention it, but it's very obvious and you can find it very easily) and with the appropriate discounts it's under $40 shipped, plus you can return it within 30 days, no questions asked. It has the SST-20 LEDs I've been raving about, a simplified UI without the crazy modes that most of us don't have any use for, and a customized battery. The battery is both a good thing and a bad thing though. It has a built-in USB port for charging, but it's also proprietary, and it looks like you might have to go through the manufacturer (in China) to order a spare. I'd also recommend getting the 10507 optic (if you'd prefer it a bit less floody), the stainless steel bezel, and the deep carry pocket clip while you're at it. Pretty cool that it comes with the glow gasket installed.
Here's a quick and crappy pic of some of my lights.

From left to right, Olight Baton 3 (proprietary 16340), Acebeam TK16 Osram (16340), Lumintop FW3A with 18350 battery tube, Mecarmy PT16 (16340 but accepts 18350), Jetbeam RRT01 (18350), Jetbeam Raptor RRT01 (18350), Lumintop FW3A (18650), Seeknite A01* (AA/14500), Lumintop Tool UV (14500).
*(the Seeknite is a rebranded Convoy, one of many rebrands)
Note that the longer FW3A is the only 18650 battery light pictured, yet is barely bigger than the Raptor and the Seeknite. The FW3A puts out far more light than any of the other lights (except the other FW3A), yet packs a 3000mAh or 3500mAh (depending on brand/model) battery, whereas the 18350 batteries are barely 1/3 the capacity (1000-1300mAh) and the 14500 batteries are 900mAh. If you were to chart a lumens vs volume ratio, the Lumintop FW3A would undoubtedly be one of the champs.
I don't have a Noctigon or Emisar, or even a FW4A, but being 4 LED lights, they're going to be bigger in diameter than the 3 LED FW3A. I really like the ~1" diameter of the FW3A and I'm not sure I'd want to EDC anything bigger around. The Mecarmy pictured, for example, although is also a 3 LED light, and short, is a real chunk of a light because of the larger bezel. If you happen to have some wood dowels or PVC, or even a prescription or OTC pill bottle that has a similar diameter to these lights, it might help you to get a physical idea of how big you want, or don't want, a flashlight to be if you plan to actually carry it in your pocket.
On a side note, the best thrower of all the lights above is the second smallest, the tiny Acebeam TK16 with Osram LEDs. Apart from the FW3As, it definitely has the most "holy crap!" factor out of all of them.