An OK light, cheap, but annoying to use.
359088
It seems like an OK flashlight to me.  Quality appears good, and it uses the perfect battery.  Though the AAA ability creates a case where you need to use a sleeve on the 18650 battery to make it fit properly.  That's kind of annoying.  The light ate through 3 AAA batteries in no time at all it seemed.  I didn't get a good chance to see how long because the light gave out before I could realize it was not shining any more.  On the 18650, I've run it for a few hours so far and it still seems strong.  As with most lights like this one it has "modes" on the power button.  I find the annoying. I read that the button was a dual press style, so I thought I'd try it.  While that is a nice idea, the darn light still changes modes when you turn it on from the last time/mode it was set to.  So, if you only want to use the brightest setting, you'll need to go through a button pressing marathon each time you use the light.  I HATE THAT!!  Seriously, hate it.  Plus sometimes, I mistakenly turn off the light just trying to change modes.  I'd much rather see a light with two buttons, or just bright only.  While I can see a reason for flashing, the multi level light is useless to me.  Just give me a light that does bright only and nothing else please.  And, I think I've seen 18650 style lights that were brighter than this one.  It's good enough I guess.

It is a good construction at least, and very nicely priced.  Feels heavy, but if you pay attention the "weight" is around the head of the unit, but not the head.  It's as if they put a phantom weight inside the light to make it seem heavier than it is.  This is a trick used by many cheaper makers of some well known devices.  You can really notice this when you remove the end cap to put the battery in.  That cap is almost weightless.  Some other nice things though, it does come with extra O-rings to help keep it clean.  And, you can easily remove the lens to clean it there to keep the light shining bright.  So, if you want a fairly good flashlight and don't mind the headaches of it's use this is an OK one.  Through the cheapo gift flashlight that comes with it as a bonus away.  It's worthless...
666443
I've owned several similar headlamps for working in the dark, which I eventually lose or break and need to replace. This was my latest purchase - I was attracted to the high lumens and apparently compact design but regret my purchase. This has been my least favorite headlamp for the following reasons:

- I do not believe that this light is actually 165 lumens. In high mode it's not brighter than the 120 Lumen Princeton tech or Petzl headlamps I've owned, and far far less bright than a 200 lumen flashlight I own.
- The light itself is physically larger and bulkier than any other I have owned, even though it takes the same number of AAAs
- It is the most uncomfortable headlamp I have come across. The lamp has a hard flat plastic back which hurts my forehead after about 30 minutes. It also needs to be worn very tight, because
- The band is made of a slippery fabric, causing it to slide down onto my eyes from time to time
- I have a lot of trouble shutting it off. I frequently find myself cycling through each mode over and over. (Does anybody actually want an SOS mode?)
- One of the plastic buckles was installed backwards during manufacturing (I can't imagine it being purposely made that way), so it just slightly bulges into the side of my head. There's no way to flip it as one part of the band is fused into it.

I can't say that I hate the lamp because it does work, but I think I will purchase a smaller and more comfortable one and keep this as a backup. If it were brighter than my others I may give the size and comfort a little leeway, but I think the 165 rating is overly optimistic.
423785
good: can recharge directly with a USB cable, ultralight and small

bad: over priced, light is pretty dim.  packaging lamp feature is a cheap gimmic.  The bright mode is really a spot so is too focused to be useful for many things and the spread is pretty dim.  It would be really nice to have a well spread150-200 lumen light mode.  It would cook the battery quickly.  I could not get the thing to delete the extra light modes despite following directions to hold the two buttons for the requisite time.

Sadly this light is still the best on the market for ultralight back packing (assuming you either are not out for too long, or have brought along an extra battery pack), but it still has significant tradeoffs that are not represented in price.  I will be using it on the AZT.  Hopefully some other company will come up with something better soon.  Petzl has some goodish lights, but they have the adaptive light level which makes it impossible to manage battery life while out for a long time.  Also they are heavier with more battery and brighter light.
763368
Good light, Good quality, but poor design. I wouldn't buy it again.
- Clicking light is loud if trying not the wake your partner when reading in bed.  Plus you have to go thru all the light levels to get it to shut off.
- Neck is really short, no way to attach it to a headboard.
- Too heavy to attach to a book.
- Charging is a fast but a bit of a drag since only usb.
- Clamp is good, but not positioned properly to accommodate reading in bed.
Basically, I'm using it until my other lights come it.  I wouldn't buy it again.  But I'll use it until my other light order arrives, and then it will end up in a drawer.
4365944
I remodeled my kitchen and put in this light. It's bright and has a nice color reminiscent of incandescent lights. Unfortunately, it seems to strobe at the frequency of the mains current which is really annoying. Waving my hand looks like I'm waving it in front of an old-fashioned TV screen. I cannot understand why the manufacturer of such an expensive light fixture would cut corners on something so obvious. None of my standard-sized LED bulbs do this. I expected better at this price, especially for a fixture that has plenty of space for any electronics it might require to produce smooth light output.
1091431
I have had it for a year but rarely used it. It is not very bright but acceptable for the size. The main reason I finally decided to threw it away is that the light often flickers randomly especially when the lamp is on two lower brightness settings. It can be quite annoying.
1806947
Not as good as I had hoped, but good for the money. You can't wire them to turn on when plugged in or by a switch. They have a little red button on the side you have to press each and every time you use them. Very aggrivating. I mounted 4 of these, and so any time I need to light them, I have to get out and go to the back of the vehicle to turn on the rear lights by hand. Also, almost invisible in daylight.
3598963
Not a great light.  Decent, but there are much better ones out there for the same price or a little less.
2013908
This light is pretty cool but has a couple flaws.  First off, the light is created using a mixture off colors, so if you want a solid/flat white or yellow..you cant get it because you see greens and reds coming through.  No big deal really, just want people to know that a lot of the colors look like the color but with a rainbow pattern coming through.  The other issue is, since this uses an IR remote, the light can be changed by other IR remotes like your TV remote.  I have this in a light figure next to my TV and every time i adjust the volume, change channels, etc....the light changes settings.  Super annoying, had to move the light to a fixture i didn't really want it in far away from the TV.  The only really nice settings are the flow and smooth settings, and of course just fixed color setting.  The strobe setting is really annoying and the light defaults back to it randomly.  For the price, i really cant complain, but like i said it has its flaws.  Probably best for kids or party's, not for permanent lighting options.
1726301
I really wanted to like this light, but it's just not very bright. I would suggest getting one that has a few more lumens. I put this next to a 3000 Lumen light, and a 800 lumen light. It's hard to tell which is brighter next to the 800. I wanted to use this for a small room, and it just wasn't doing the job for me unfortunately. Also, when taking apart this light, it got stuck and would not come apart.
385020
"It's OK" for the price, but it's a bit shabby. The battery compartment does not close well. The light is OK in terms of brightness. I plan to use this for a few days only, finishing a home project, that's why I'm keeping it. If I had intended to keep this working longer, I would probably return it.
1460191
I bought the 3-mode flashlight pair. The modes don't work well at all. Each time you turn on the light it starts off at a different mode (rotates through the bright, dim, strobe). So every 3 times I turn the flashlight, it's strobing in my eyes! A normally built flashlight would turn on starting on the bright/dim mode and let you rotate through yourself. So for this light, it does let you rotate modes after the light is on, but it's really quite annoying to have to adjust it every 3 times you turn it on.

It has a zoomable front lens that lets you focus or spread the lit area, but if you push it all the way in, it shows the little rectangles of the LED rather than having a focused circle.

The spread of the light is also poor quality. There are rings around the main focused lit circle.

I would spend the extra $10-15 buying better quality flashlights.
3828141
The "headlight" is essentially a removable flashlight of standard dimensions (3 AAA batteries in a cylindrical insert).  Has focus settings for wide or narrow beam.  I found it not to be as bright as I would like, actually I own a commonly available flashlight of the same size that is about four times as bright at the same distance and beam width).
The "tail light" is very disappointing.  Made of cheap plastic inside and out.  A plain flat band of rubber between the lens plastic and the body plastic is all that stands between the rain and the batteries.  I have no faith in the tail light.
The fasteners are plastic with a rubber layer and tightening screws.  Nothing fancy to report about it.
Would be ok for $5-6 but not for $16+.  I won't be returning it to avoid the hassle of removing it from the bike, repacking it, etc., just for a few bucks.
1001923
I bought this because the most excellent JetBeam rrt01 has been discontinued. This is a pale imitation of that great flashlight (of which I've owned several and given a couple as gifts).

A number of things I don't like about the light: it has a click button to turn on as well as a light output ring. Why have both? The rrt01 shows that you only need the ring. I didn't think I would mind, but it has been annoying when using. The second thing about this light I don't like is that the lowest brightness setting doesn't go as low as the rrt01. That's annoying, because there are certain situations where I want a lower output than the light can do.

If those were the only two things wrong with this light, I would have given it 3 stars and be done with it. It would have been an okay flashlight...

But a little bit after buying this light, it started flickering when on. This happened past the Amazon return period, so I can't return it.

When I reached out to the manufacture to get it replaced (it has a warranty), they emailed me a long list of things to try to diagnose the problem (to figure out if it was the tail switch or the LED mount that was the problem). I'm a tech person, but it was sort of daunting to try the stuff. By opening up the case and jiggling it, it seemed to have fixed the problem, but no, after a few days, the problem has returned. I will probably end up returning it to get it fixed.

That's why I'm giving this light one star: it's an so-so light when working, but it looks like the manufacturing of it is not very good. Stay away.
4633670
I purchased several of these to keep in my cars as a "throwaway" light of sorts.  I keep a personal light on me at all Times, but you never know when you may need an extra one around.

The claimed 300 lumens seems exaggerated even on fresh batteries.  The J5's light output is honestly not much better than an old first generation (~80 lumens) Surefire 6P LED which I've owned and used since 2008.  The zoomable light pattern is pretty focused, such that even at its flood setting the light has very little spill so it doesn't illuminate a very wide area.

The 3 mode switch is inconsistent at best.  Out of the six lights that I purchased, two of them don't switch modes correctly the vast majority of the Time.  Occasionally one of the modes such as the strobe won't even work, and then magically it might work once after you've cycled through the "three" modes 10 Times, and then not happen again for another half a dozen cycles.  A third light has its modes not work consistently.  I don't really care because they are cheap temporary lights, the strobe feature is a pointless feature and I wish there was a simple way to lock it out.  But if you're relying on all three modes to work consistently every Time, prepare to be disappointed but be happy if you get one that works correctly.

Having said that, I bought these lights for about 8 dollars a piece after a discount and they'll hang out in glove compartments as a small backup light.  They're not "tacticool" or high grade and at the price they're not bad, but they do leave me wishing that I'd just splurged a little and gotten better lights for a few more bucks.

You get what you pay for.  It isn't much of a flashlight, but it didn't cost much either.
4842757
Not a bad light for the money but there are better ones out there with more output and better lumens.
2703976
This unit has some good features.  It's sturdy, it pivots up and down, and it offers green, red and blue lights in addition to white.  The problem is I don't need green, blue and red, and it requires lots of button pushes to cycle through the colors to turn the white light on and off. The other issue is that although the white light has respectable brightness for being powered by 2 coin cells, the pattern of the light is oval, and the oval is tilted 45 degrees to the left, pretty strange.  I attribute that to a bad lens design, or possibly the LED light not installed perfectly for the lens to work correctly. I might have a defective unit in that regard.  Being the most expensive of the three models I ordered to test, I don't recommend this unit.  The sister model called Browning Night Seeker Cap Light is cheaper, offers Green and white, swivels, is sturdy, and requires only 3 button pushes instead of 5 to cycle through.  The white light of the less expensive Browning Night Seeker Cap Light  has a good spot light pattern and is slightly brighter than this Mossy Oak unit.

I personally like another brand, the Cyclops hat light on Amazon is best for what I'm looking for.  It's the least expensive and has more of a flood light dispersion of light without hot spots.  You can't see as far though, so it's not for hiking, the Cyclops is excellent for working in tight spaces where you need an even medium light illumination. Cyclops also has a spring steal clip instead of plastic, it appears more rugged, the only one like that on Amazon.  This other nice feature is the Cyclops has a slide switch to turn each light on.  Slide left for white and slide right for green, no hassle of cycling through with one button.

So if you want a spot light for distances more than 3ft way, I recommend the other browning unit, Browning Night Seeker Cap Light.  If you're looking for a light to light up something you're working on, such as under a cabinet counter, under a car dash, under a car, under the hood, etc, the Cyclops is the one to buy IMHO.  The Cyclops does not swivel, However, because the light is a flood light, there's no need to swivel.