Great bulbs, just don't run on a circuit with Halogen bulbs as well
586923
These bulbs have a good color of light for my under-cabinet lighting and respond well to a dimmer. However, they do not dim properly if on the same circuit as traditional non-LED G9 bulbs. I initially tried replacing 2 of 9 bulbs that were on a circuit and they had issues flickering as they dimmed. Once I replaced all of the bulbs on the circuit this went away. I'm not sure if this is due to the wiring of my lights or the bulbs instead.
3616198
First and foremost, let me say, anyone should know that unless the bulb says DIMMABLE, you should NOT put an LED bulb on a dimmer switch, because of the circuitry involved.

Now, to review these bulbs ~ i have had them in for 10 days, and have left the lights on several times for 10 hours straight.  The beauty of these bulbs ~ they consume very little power, and they generate no heat at all.  They are as bright as the halogen bulbs they replaced, and the color (daylight) is way nicer that the warm white (yellowish color) of the halogen bulbs.  On the sconces these are used in, each sconce takes 2 bulbs, and I was replacing the halogen bulbs (Sylvania / Phillips) about once a month, sometimes more.  I checked my bills, and in a year, I went through about 19 bulbs!  These LED's should last way longer than that.

The only knock that i have on these bulbs is that the base of the bulb is a fraction of a mm too big, so when I push them into the lamp socket, they don't quite sit in properly.  You have to push quite hard to get them to click in (to the point I was worried I would break the socket / lamp).  They finally clicked in, but just the slightest bumping of the sconce (like trying to put the glass shade back on), and the bulb would pop out.  Finally got the bulbs to stay in place by being very vey gentle putting the sconce back together.  Other than that, the bulbs have operated flawlessly!  The missus loves the color of the bulbs, especially for putting on her make up!

I would recommend these to anyone looking to replace halogen bulbs ~ for operating cost, and energy efficiency, and for going green.
3440568
I needed bulbs that would be close to the form factor of the halogen bulbs they would be replacing, so that they would fit into small track lighting fixtures. All of the other bulbs that I look at were too long.
Turns out these are just a little bit longer than the halogen bulbs, but still fit. Dimming ability is decent.
Note that they don't give out any backlight, and so will not illuminate your fixtures, if that is what you need, look elsewhere.
2693298
I LOVE LEDs! Bright light with no heat!!! And the prices for LED replacement bulbs just keep coming down too.
I bought a set of these to replace the Halogen lights in our above bed dimmable reading light. I didn't want to junk it, and I didn't want to just get new, but now less expensive, Halogen lights again, but they are just too hot. These were not available anyplace locally so I looked on Amazon and found them there.
On arrival they installed perfectly and on full power they are very bright, actually, I think brighter than the Halogen lights were. On some lower settings you can get to a point where the lights flicker, but is not an always thing and just turning them back up a bit usually fixes the issue. I do think it may be an issue with this older light fixture that wasn't made with LED lighting in mind but overall it works fine, very happy.
We have replaced almost every light in our home with the new LEDs replacement bulbs of various sizes and we are very happy with the conversion!
1026611
I replaced the 3 halogen (hot and energy-hungry) with the 6.5W LED bulbs in my office's overhead  fixture from IKEA and these LEDs are great. Whiter than the standard bulbs or the halogen but not too bad. They're very bright, can't look at them directly without discomfort, but they're perfect for a 10x10 room, though I have them pointed toward my desk, which is the reason I have the overhead fixture.

Dimable, but don't dim all the way down because my dimmer isn't made for LED lights. No flickering as some reviewers noted, unless the dimmer is all the way down and I turn the lights on; then I can see some almost imperceptible flickering. Once I turn the dimmer up they don't flicker. But, when I then turn the dimmer all the way down, they don't dim completely. I think the problem is the dimmer. Older ones are for higher voltage bulbs not the low consumption LEDs.

I've been using them for a week with no problems. As to their longevity, I'll update this review if they burn out in the next several months. The seller says they should last 50,000 hours. We'll see.
1149341
We had a handsome pair of brass bedside reading lamps that we seldom used as they burned very hot with the halogen bulb. I saw these and thought I could retrofit the fixtures. They are larger than the halogens they replace so it required a bit of retrofitting the lamp hood. When I disassembled the units, I found that the heat from the halogen bulbs had deteriorated the wiring causing them to smell as well as become brittle to the extent the insulation was cracking off. I am very happy with these as replacements for the halogen bulbs without trashing the fixtures.
3424229
Fabulous. Look great, dim nicely, no noise, don't get too hot. Mine are recessed into the ceiling though, so I cannot give much more feedback.

Our landlord had CFL's in these sockets before I replaced them, and when dimmed, the switch would buzz. I did not like that one bit- these fixed the issue.
3917680
These caused interference with my television and radio signal but that is pretty common with LED bulbs. The light output is very nice and I prefer it over the old standard bulbs I had in. They do take a second to come on, but it is barely noticeable and they dim very low. I am using them with a slide dimmer that was made to work with LED and CFL bulbs.
468695
A great replacement for the standard Halogen bulbs. Check the size and make sure they'll work for you, they were too large to fit inside our fixtures, but by bending the prongs we could get them to work albeit with the light poking out of the fixture. Since they're hidden under the bottom of the kitchen cabinets, it didn't matter but if yours are visible it could be an issue.
4388787
I put these bulbs in a 2014 Honda Accord with projector beam headlights.  I could see an immediate difference in the brightness over the OEM bulbs.  Not quite HID or LED-bright, but the best halogens I've seen.

Now, if they'd only make an H-11B style, I can do my wife's Hyundai.

**Update August, 2015 - Considering I don't drive much with the headlights on (a couple of hours a month, at most), one of these bulbs burned out.  I was very disappointed because I felt that 18 months is a little short to have these burning out, without much use.  So, I'm lowering the review.  I decided to spend a little more and get LED H11 bulbs, which work absolutely great.  I'll have to see how they are in the long run.
986657
These light bulbs are awesome. No flickering, they work great with dimmers as well. The light output is pretty good. I would say roughly the same as a 35 Watt Halogen. I like the daylight light color of these especially for outdoor lighting. The only problem I have noticed is that these are a little bit longer than Halogen and do not fit in some light fixtures. It's just a few mm but it's enough to not fit in same situations.
4750590
Fit perfectly to replace 50 watt halogen bulbs, light difference was undetectable to me. The fixture I used has a full metal shield around the sides of the bulb so light leakage from the halogens were wasted, not having it on the LEDs works perfectly.

Temperature difference is amazing, with the halogens touching any part of the fixture while the bulbs were on would easily result in a burn, they get everything hot! but with the LEDs I'm able to touch the bulb itself and its only mildly warm. Combine that with a power draw that is 1/10th of the halogens and these bulbs are a winner and I'm getting more!

I have seen reports of others with dead bulbs, so far I've had all lighting without issue, so maybe that was simply a bad batch of bulbs.

Conclusion, I like these bulbs, will be purchasing more, and will be recommending others to get them as well.

EDIT: With light usage for 4 months I'm now down to 2 of the original 5, they've been burning out quickly. The design of the LED PCB routes through all bulbs in series, so if one LED group dies the entire bulb dies. I haven't done enough testing but I'm suspecting that they are pushing too much current through the LEDs to make them brighter and they are simply burning up.
695011
I've now replaced fluorescent tube lights in 5 rooms with LED's.  Four of the 5 were replaced with Hyperikon bulbs.  Two of the rooms replaced with Hyperikon were double ended LED's and the last two were with these single ended bulbs.

The bulbs themselves are great and I have no qualms about recommending them.  Brighter and more efficient...can't go wrong there.

My reason for this review and the only reason I dropped a star is that the instructions with these single ended bulbs are not up to par.  The actual installation is truly very simple, but the instructions seem to make things more complicated.  There are references to red arrows (there are no red arrows in the illustrations) and a note on page two regarding instructions on page one that don't exist.  There are notes to skip to step "V" when it should be step "III" and so forth.  Missing from the instructions altogether are how to insert wires in the tombstones or more clear direction on jumpers for replacing instant start ballasts.

Still highly recommend these bulbs, but hope that Hyperikon will review their instructions for clarity.
3493593
These are great bulbs.  The color depth is where I wanted it and they work great. The form factor on these bulbs is a bit large however.  I bought them for a Broan bathroom vent/fan/light.  You cannot fit 2 of these bulbs into it, I had to use one of the old CFL bulbs just to make it fit. (The length was the issue)  They fit in the bi-pin base without issue.
28384
These bulbs create next to no heat, use almost 90% less electricity than traditional halogen bulbs, and are fully dimmable.  One small quibble - in future I would purchase not the daylight but one of the other colors that are a bit warmer (i.e.slightly more yellow color.)  The bulb is incredibly bright, and unlike other low energy use bulbs, don't require any warmup time.  I will eventually be switching to all led lighting in my house.  The price for these bulbs is comparable to halogen, they should last a lifetime, and energy use is a fraction.  Win - win!
2538816
For some applications, this is a great bulb.  I would not use it where lots of light is required (there, I use 10W and 12W LED bulbs), but for many applications, such as dual lamp ceiling lights in bedrooms, and hallway lights, it works very well.  These are daylight bulbs, and I prefer the white light to the orange light from incandescent or florescent bulbs (yes, you can get daylight florescent bulbs, but I have a hatred for those types because of the mercury content).

Today, you can outfit your home with LED bulbs at reasonable prices from Amazon.  I have 15W LED's in the garage ceiling, 12W bulb over the kitchen sink and in the laundry room, and 10W bulbs in the kitchen ceiling, entrance hall,  and various closets.  I use a combination of 10 and 6.5 watt bulbs in our walk-in master bedroom closet.  Power consumption is so low it is amazing, with better lighting than before!

It's time to get serious with LED lights, the prices have really come down!!!!
848
I love the lights. They are well-constructed, sturdy and look great. My only complaint would be that we received one bad bulb which shorted the whole light strand and tripped the circuit breaker. After we figured out the problem, we switched out the bulb and everything worked fine.