Installed on a Suzuki GSR 2008. The difference is huge both in the low beam and the high beam, in brightness as well as in range.

They were installed on a V-Strom 2007, installation was easy, tested during the day on a special light beam control panel and it really made it like daytime. The light beam did not change on low beam, only a small difference on high beam. I will try it at night and report back.

So, I see various reviews and I have to say that I switched from regular H4 bulbs to these, and the difference was huge—like night and day, as they say. Of course, the condition of the headlight also plays a role. The car I installed them in is a 1998 Honda, so there are no issues with CAN bus or confusion with the beams, since newer cars have sensors everywhere and can have problems because when you turn on the high beam, the company has designed it so that the low beam also stays on at the same time, and this can cause issues with modern cars where the command goes through the ECU. For their price, €22, they are more than worth it, as long as the car can support them. The installation was super easy; I didn't need to cut anything.

I bought the product in the summer and installed it in my car where I found that the .H4-A500-N39 has issues... One is that the high beam does not have satisfactory brightness like the low beam, second it reduces radio reception, third I lost the indication of the high beam on the dashboard and fourth and most importantly, on the road, the light suddenly started flickering as if it was rapidly switching between the beams, which makes driving dangerous, so I removed them from the car and requested a replacement with a different model, which was accepted. I don't know if this specific model is faulty or if it just happened to me individually.

H4 installation today, tonight there is a test, and a full evaluation, the fans went in very easily, they make noise when the engine is not running, more updates tomorrow.
On 18.6.22 I changed one headlight due to a reflective mirror, and the light is incredibly white and powerful.
A friend put in H1 and finally can see the road with old headlights in mediocre condition.

Unfortunately, I trusted them but they were not worth it. For the two days that I have had them, I have encountered two problems. Firstly, the radio signal weakens, resulting in no signal at all. Secondly, as soon as they warm up, the scales do not function properly. For example, when you have a high volume, you lower it to medium and they do not respond. After five seconds, they suddenly lower the volume, causing other drivers to be blinded. I do not recommend them.

I was ready to buy the NovSight A386-N9-H4 60W 10000LM 6500K, which cost 28 euros. But I saw that these are a much newer model and have more watts... and in the end, I did the right thing. Incredible light, very powerful on both the low and high beam. I have installed them on a 2019 Kymco Agility 150. Imagine what kind of light they would have on a car or a larger motorcycle. Go ahead and get them without hesitation, they are amazing. I will also buy the same ones for my other vehicles. The light is pure white. Besides, they are 6000 candles