Bright, worked great...needed silicone
595010
Very bright! Work great in below 0 temperatures. I read on the reviews that they were susceptible to water damage due to poor factory seals. I took a caulking gun and spent three days covering each lights surrounding seal in silicone. Might not have been needed but I took precaution and never had an issue in the rain or snow.
3103780
Great lights, very bright.  They are plastic so you have to handle with care.  I dropped one and it did crack.
1493401
Bought for an atv. Mounted the light and tested it with a 9v battery and it seems really bright. However, after 1 outing getting into some mud and then a subsequent car wash, the light got water inside. I removed both ends of the light and dried the water with compressed air and a heat gun. I then used silicone to seal up both ends of the light as well as the rubber cover that goes over each end. I tested again with a 9v battery and all of the lights still work. Hopefully my silicone job will resolve the leaking
790094
worked great, very bright, maybe too bright/concentrated, glaring in the middle of the night.
1681898
Ordered this "kit", it consists of 4 smaller bulbs, 192 wedge type, and one festoon bulb for the dome light. My front overhead compartment one light wasn't working on the push button and when the doors opened. Getting the console off was the hardest thing. Just pull hard and the 4 clips will release. My circuit board was actually partially melted fron the incandecent bulbs. After repairing the circuit board, I replaced the bulbs. I had to rotate them and re-install because of polarity? I guess? Did the license plate, dome, and overhead console. The lights are brighter but more blueish color. I am very happy with them.
2170436
Nice LED lights, and very bright.  The sockets and wiring appear to be pretty heavy duty, but the LED bulbs are glass, so those need to be handled with some care.
628435
Bulbs work as described (purchased for backup lights for my 1989 Ford F250 pickup). I recently put a light tint on my rear window, and quickly discovered that it made it a little more difficult to see when backing up at night. I was hoping to find a backup bulb that was brighter than stock in order to compensate for this. Thes "bulbs" are very bright to *look at*--brighter than stock--but I'm not sure whether they actually illuminate the area any better. If you haven't compared LEDs to incandescent bulbs, side by side, it's kind of difficult to describe, but it seems as though they may simply be "whiter", and not necessarily "brighter". I was originally thinking of going with a 68-LED bulb, and I'm so glad I didn't do so--I can't imagine how dim those may be (all things being equal). I should mention one other thing--the "finish" is a little less than I would have expected--the column to which the LED nodes are affixed sits in the base a little crooked--it's not exactly straight. I'm not sure whether this will make a difference at all, but it was a little disappointing in terms of quality of finish. All in all, I'm looking forward trying these out in the coming months.

UPDATE - JAN 2015 - Still working GREAT!! I love these. SO much brighter than factory incandescent bulb, and at a fraction of energy usage. Definitely would buy these again.
2360426
I added some extra welds, as it is only tack welded in a few places. I also had to drill a couple extra holes to mount for my particular application. I would and probably will order another set for my other trailer. They work great and are very bright. I use them on my boat trailer, so I needed submersible lights and these fit the bill! they will need paint or powder coat, so keep that in mind. the gaskets were a pain to get in there, and worse when I had to remove it because i forgot to connect the wires.
451439
Used them for the interior lights in my Sienna Minivan - they are a bit bigger than the incandescent bulbs, but they fit OK everywhere in my case.
Color is daylight  bluish white - closely matched some 6500K fluorescent tubes in my shop
Easily as bright as the 6 watt bulbs they replaced
I bought 3 packs of four, and all 12 bulbs were perfect, at least initially.
I measured one of them when powered from a regulated 12VDC supply, and it used 0.042 amps ( almost exactly 1/2 watt at 12 volts), less than 1/10 the consumption of the bulb it replaced.
Some folks buy these for the cool look - I got them so that I could go camping and leave the doors open for a some light without killing the battery. I'd give them 5 stars if they were a little less blue white - my taste is for a more neutral white.

4/7/13 update: I had enough to also put them in the door courtesy lights of my Mazda sedan. They would not fit without a small modification. I had to shorten the base a little (just sliced off about 1/10th inch with an Xacto knife) to get the light lens to snap back on. The plastic cuts easily with a sharp hobby knife - you just have to be careful not to cut the wire leads.
1940398
I only wish there was a silicone strip inside the band to help hold it steady across my forehead.  Beat my expectations though!  Really friggin bright.
2657590
These lights are great.  Bought for use at a private camp site deck & also a 2nd for use at recreational land we own.  The lights are not over-powerfully bright, they provide a nice glow. I would have given 5 stars, but we had to splice 1 set & we ended up cutting off almost 3 feet before we found a connection that would work.  It turned out ok as we were able to move the ends on the deck roof, but that was disappointing.  Would still reccomend though.
606996
We've been wanting to replace our fluorescents with LED for a while, especially in our garage, where the fixture eats bulbs for breakfast, but the two we'd tried were not plug-and-play, despite their promises.

These are - they pop right in and work no problem. We find them very bright, but that's probably because we're used to always having at least one dead bulb.

Caveat ordering from Amazon - these were not well-packed and a number of them have cracks. The cracks do not go entirely through the bulb and they work fine (thus far), but Amazon needs to work on how to package these for shipping.
535559
I bought two of these and cut them up using metal shears to fit insight of ceiling fans with large light kits.  On one I had to extend the wiring from the transformer to put it in the fan body.  Much cheaper than the round retrofit LED arrays and super bright.

Yeah, no warranty for me, but I'm happy.
3473072
I have no complaints with the LEDs or the light output.  These are bright and light up the canopy of a 40ft tree nicely.  I've only had them up for 2 days so not sure of longevity. The housing feels sturdy as does the spike. The only complaint is the part that connects the spike to the light. It is a flimsy peace of junk. I bent the heck out of it trying to adjust the light even after loosening the screws.  My dog barely grazed it and it bent and needed adjusting so the light was where it's supposed to shine. I'll probably make that part myself out of sturdier metal. For the price a good buy even considering that problem, hope they last
1037195
This is my second purchase of these lights. The first time I bought 4 to put on the front bumper of my truck (1 on the driver corner pointing at 11 o'clock, 2 centered at 12 o'clock, and 1 on the passenger corner at 1 o'clock). They worked great but after about 2 months, one had moisture building up inside and eventually stopped working. I bought this set of 2 to replace the messed up one and to have a spare. They need silicon around the lenses. If I have more problems I will be buying a more reputable brand to replace all 4 lights.
4478120
I was thrilled to see that I could get an LED replacement bulb (and reflector) for my beloved old mini-mag lite. Replacement was easy.  It's crazy levels of brighter than the old incandescent. I had no idea the mini-mag could be that bright. It might even be too bright for one of my applications (used with red filter to view star maps and not destroy night vision). Unfortunately after turning it off and on a few times (mini-mags incorporate the on off switch in the twist of the head/reflector - off is tightest, on is looser) it suddenly would not turn on anymore. Taking it apart to see what had gone wrong I discovered to my horror that the electrical leads leading into this bulb are not strong enough to stand up to the twisting forces as you tighten the head to turn it off. This twisting action twisted the bulb and therefore the electrical leads onto themselves leading to an electrical short. Bad!

It's not so hard to fix in my opinion, but it would be nice if the TerraLUX people supplied the adhesive and instructions (Or came up with their own fix) to prevent the problem. I had to gently untwist the electrical leads to make them close to parallel again. Then to prevent the problem from recurring I placed a very small amount of  RTV "silicone" glue (good glue but removable if needed) between the back of the bulb and the faceplate that it sits against. This prevents the bulb from rotating with respect to that faceplate/socket.  It's possible that a little dry lubricant between the reflector base and the top of the bulb disk will also help to prevent the twisting force transmitting to the bulb disc.

Note that the current photo of the bulb is slightly incorrect. It now has a smooth (black) face to allow better sliding between the reflector and the bulb face. Unfortunately even that necessary tweak does not prevent the bulb leads from getting twisted on themselves.
855014
Great light, brighter than expected, but not very tough. I used it as a supplemental reverse light on my jeep, and it broke the first time I tore it off, which isn't great, because it was only held with epoxy (I was prepared for this). Otherwise, if it's not going to be abused, I would recommend it. It's a great price for a close range wide angle LED that is surprisingly thin.