Today I have a special light on my review table, the Frelux Synergy 2. If you are a long time subscriber (Youtube) you may remember that in October of 2018 I reviewed the original Frexlux Synergy 1 side-by-side flashlight. The Synergy 2 is the larger big brother and brings lots of new improvements and upgrades to the side-by-side format, and is almost entirely made in the USA. Let's settle in for a longer review and look at the Synergy 2.


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Packaging
Packaging for the Synergy 2 is a custom made cardboard box. Itís basic, but neatly done with just the Frelux logo and slogan on the top. The inside flap has a quote and a US flag to remind you the light is made in the US. Inside, the light is protected by a laser cut black foam protector. Accessories are a Frelux sticker and little quick start manual with a link/QR code to download the full manual.






Construction and Machining
The Synergy 2 is made from US sourced 6061 aluminum. It is offered in a large variety of anodizing colors with Black, OD Green (what I have here), and a blue being the core colors at the time of review. The clip is made of grade 5 titanium and is also available in raw, gold, and blue colors.



Itís a side-by-side battery design, with the batteries in a parallel circuit. At the front of the light you have two brass contacts that have physical reverse polarity protection provided by a circuit board surrounding these contacts. The result is a light thatís a little picky on 14500 batteries if you decide to run those. Button tops are required, and watch the diameter of your cells too. Frelux has a list of tested batteries that are known to work with the Synergy 2, and itís probably best you stick to those. VapCellís 1100mAh models seem to be the best option (14.09mm). My 800mAh Keeppowers (14.41mm) were a bit too large in diameter.




The Internal Construction is a neat design; you have a brass threaded rod spanning the length of the light that threads into the head section, goes through the middle and tail section, and then the tail nut tightens everything in place and provides compression on the o-rings on each section to provide water resistance. The switch up front is an electronic switch, but itís a very satisfying feeling too; itís solid and crisp. The switch also has a mechanical lock feature which I recommend using during carry. Just rotate it clockwise and the button physically canít press the e-switch. There isnít any visual sign itís locked, which is a little disappointing, but itís an effective solution and keeps the UI simple. The Synergy 2 doesn't carry a formal water rating, but Ben has tested it in a 8ft column of water overnight without a problem, so it should be ok in most situations.



The tail brings the light all together; externally it has a nice USA engraved on one side of the black button and the battery orientation diagram on the other. The tail nut is a cool piece itís what holds the entire light together and holds the clip on the light (along with the dovetail) during battery changes via an o-ring, which is a nice improvement over the Synergy 1. Internally there is a circuit board with three springs-two for the batteries and one for the brass center rod.







Machining
One of the reasons why I enjoy this light is all the machining content that is shared on the Frelux Instagram page. I am a want-to-be machinist. I enjoy watching several YouTubers make stuff, and just want a machine to play with. Ben of Frelux produces these lights in his home shop with a Brother CNC machine. Make sure you check out the video version of this review for some of this machining footage.

What's somewhat unique here is how he has setup the 4th Axis on his machine along with the four sided pallet design, to maximize his machining times and get the most work done per cycle. With the pallet design itís almost like a 5th axis machine. He designed a tool that mounts in the mill to allow the mill to rotate the parts in the fixture and continue machining without human interaction. The Synergy 2 took all of this into account during the design process. It allows him to maximize his time while the CNC is running to get the next pallet of parts ready and do other finishing and assembly tasks. The end result is a light that was designed with production and keeping the overall final product affordable in mind. All tumbling and anodizing is done in house for tighter tolerances on quality. Even the soldering of sub components, finish assembly, packaging, and shipping are done at the Frelux headquarters.
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Size and Weight
I measured the overall length at 95mm, width at 41.6mm, and thickness at 21mm not including the clip. Weight with Vapcell 14500 batteries is 6oz or 170g. This makes for a decently heavy light for its size and material. This design inherently has more material left after machining than a typical cylinder light. More aluminum could be removed through more complex machining internally, but it would greatly add to the complexity and overall cost. As far as competition there really are not many other side by side AA lights on the market to compare it to, so can we say class leading?





Retention
The retention of this light is interesting. I have to first start with the size and how that impacts its pocket carry. I enjoy carrying a 14500 sized light, especially in warmer months as I wear more shorts. Since cargo shorts are no longer fashionable or accepted in my house, the result is less pocket space and an EDC to suit. With jeans itís a bit of a different story. I find that despite the added width of the side by side format, there is still room for the light in my left front pocket and my phone deeper down in the jeans pocket. Itís too big for the coin pocket that you typically find on the right front side of many jeans. This is where the Synergy 1 was just about the perfect size.





That said one of the Synergy 2ís new features is itís tension adjustable pocket clip. This is a neat design, the clip is retained in a dovetail in the tail section and then the tail nut that holds the tail section on to the light controls the clip's ability to slide closer or further away from the body, thus setting the tension. It can be very tight or fairly loose, so itís adjustable to a variety of different pocket materials. That said the very end of the clip isnít flared out much so it can sometimes be a little hard to get started onto a pocket. Frelux does include a small adhesive vinyl sticker to place where the clip makes contact with the body to help prevent excessive wear on the anodizing. Itís a nice touch but I wish more then one was included in the package.

Grip in the hand is still fairly comfortable. If I choke up a bit I can still get all 5 fingers on the light. It's a kind of modified pistol grip, if your thumb is on the light jimping on the top, the jimping on the bottom ends up fitting well with my middle finger. I do wish the jimping was slightly deeper and a little more aggressive.



LED & Beamshots
The Synergy 2 is using a Samsung LH351D LED at 5000k and 90 CRI. This is a great emitter in my opinion and is quickly becoming one of my favorites thatís in current production. Itís a nice combination of tint, output, and high CRI. Itís surrounded by a smooth fairly deep reflector, with an anti reflective coated glass lens on top. There is just a hint of tint shift in the very center of the beam. I only noticed this when shining it at full power onto a white surface, itís not noticeable during real world use. The resulting beam does have a pronounced hot center and ring at the edges before you get into the spill. Practically this isnít a bad thing and the deeper reflector helps the light throw better than I initially expected. That said, I would prefer to see an orange peel reflector to smooth that transition out a little further.



This light is using a driver that Frelux had designed specifically for this light and itís circuit boards are produced and populated in the USA. It has a ramping UI that I will speak more about here in a minute. The light is capable of running on the three most common chemistries of AA sized batteries. Standard Alkaline batteries, Ni-MH producing a maximum of 250 lumens, and Lithium Ion 14500ís producing a maximum of 700 lumens. The driver features memory, Low Voltage Protection(LVP), and temperature protection as well. No PWM was noticed with either battery type.

Heat and Runtime
I ran three runtimes a few times with this light to see the differences. I focused on rechargeable batteries since thatís what most people will run this light with most of the time.

For my test with 14500ís (Lithium Ion) I used 2x VapCell 14500ís. Mine happened to be flat tops which wonít run in this light, but thankfully some small 1mm magnets worked to get around this until my button tops arrive. I got three minutes of the highest output before this light stepped down due to thermals. As you can see the heat continued to increase here but everything was pretty tame, peaking at 33.4C (which is basically body temperature). Itís a safe temp, almost too safe, as I would prefer a bit longer runtime for a little more heat. From there the light ran at 42% relative output for 2 hours and 13 minutes, before stepping down to about 18% relative output and running for another 10 minutes before shutting off. LVP was measured at 3V for each cell.


Next for my runtimes I tried with some older Eneloops (4000mAh Total). Simply put the output here is extremely stable for the entire runtime, and the light ran until 2 hours and 20 minutes of output. The last test I did was with some Amazon Basics High Capacity Ni-Mh batteries. These are said to be rebranded Eneloop Pros but at about Ĺ the cost. Mine averaged 2475mAh each after testing the cells independently. Overall runtime here was 3 hours and 4 minutes. The extra roughly 800mAh buys you about 45 minutes of extra very stable runtime. Heat on either Ni-Mh was basically ambient temps.



While the light does run on the three different chemistries of batteries, itís my opinion that the best option is really lithium ion 14500s as these give the most output and still a good amount of runtime for an EDC style light of this size. Alkalines should be the battery of last resort due to their lower output and potential for leaking; it would be a shame to damage the light from preventable corrosion. Since the batteries are in parallel the light will run with only one battery if you wanted. Same outputs, but just less runtime. It can be a weight savings measure or if there was only one cell left in the package in an urgent situation.


The driver has one odd quirk that you should be aware of if you run the light until low voltage protection kicks in. If it takes longer than 30 seconds to change the batteries there is a good chance the light wonít turn back on with fresh cells. The solution is to just leave the tail piece off for 2 minutes to reset the driver. The technical reason for this is there are two sets of code for each voltage range the driver operates on. This could have been eliminated but it would have increased the driverís parasitic drain, which no one wants.

UI
The Synergy 2 is using its own UI system, but donít let that be a worry. Itís simple and familiar. Itís a simple ramping UI. From off, a long press of the button will give you a shortcut to the lowest mode of output. From here a long press again will start the light ramping up in brightness which takes about 2 seconds to reach the top output. Unlike other flashlights there is no flash to let you know you're at the top or bottom of the range, but this isnít an issue as the light just stops and doesnít cycle over. While ramping you can stop anywhere and press the button again to reverse your direction of the ramp. Double press from on or off to jump to maximum output. There are no blinking modes on the Synergy 2, and I donít miss them personally.


Pros

  • Great emitter choice, nice tint and high CRI
  • Multi Chemistry battery support (Alkaline/NiMH & Liion)
  • Impeccable Fit and Finish
  • Made in the USA!
  • Lots of color options but they are not always all available or published.


Cons

  • No moonlight mode, lowest mode of operation is approximately 2 lumens with Ni-MH batteries and 5 lumens with 14500s.
  • The light is a little picky about the length and diameter of 14500s
  • The side-by-side format takes up a decent amount of pocket real estate.


Conclusion
The Frelux Synergy 2 is a unique light in the flashlight market. Itís a custom light in the sense that itís made by one man in his garage in the USA, to exacting standards. Everything about it but the LED and eSwitch are custom designed for this light and made in the USA. Ben machines the light himself, anodizes them inhouse in a variety of colors, solders the USA made circuit boards, and does final assembly and testing himself (and sometimes with the help of the kids). The result is a light that has very tight quality control and superb attention to detail.


It has creative design features too, like you can mix and match body pieces with other Synergy 2ís to create your own color and button combinations. The door is open to different materials for the body sections and buttons too, if he chooses to make this not only a custom light but a highly customizable one too.

The adjustable tension clip is a smart design that I find works pretty well, and being deep carry I find itís retention is good tool. It stays in place too during battery changes, which is an upgrade over the Synergy 1. This isn't all the clip does though; it can also be used to tighten the brass nut that keeps the center section mounted to the head too.


The Synergy 2 does all this at a price thatís less than your typical custom light thatís made in the USA. Itís a light I have thoroughly enjoyed watching develop on the Frelux Instagram account, and mine will definitely be in my EDC rotation. I imagine I will carry it more when I am wearing jeans vs shorts due to its width, but thatís largely a personal preference with how I carry a knife and smartphone too.


These are truly custom made lights at this point, with Frelux taking preorders and then producing lights in batches and finishing them to your color specifications. So if you are interested in one, be prepared for a potential wait. Wait times so far have been fairly reasonable in my experience, with Frelux being careful about how many preorders they take. So if you want one, make sure to join the Frelux Facebook page and follow them on Instagram too so you know when preorders open.

Overall this is a fun light and one you should definitely check out if you want to get something unique, custom designed, and made in the USA.