They were purchased for a Citroen C3 2020 for the medium and high beam (fits both H7) because I didn't like the color difference compared to the daytime/position LED lights that the car has.
Overall, I can say that I am satisfied, the bulb looks completely white just like the LED lights in both the medium and high beam. The light does "yellow" a bit when driving, which is logical considering that the bulbs are halogen and not LED or xenon.
The installation was very easy for me, I did it myself in 10 minutes for all 4 bulbs. As for the brightness that many people mention, personally, they seem bright enough to me and definitely brighter than the ones the car had before. Of course, I haven't tested them on a completely dark rural road, but in a very dark spot in the city.
Now, as for durability, time will tell, I've had them for 4 days.
In summary, for those who want a definitely whiter light than the factory ones at a good price, these bulbs are a must! Especially if, like me, you have white LED lights for the position lights and yellow factory lights for the rest. For more demanding buyers, read below!
That's the end of my review, but I will write a few more general pieces of information that I learned before purchasing, which might help you find what you're looking for.
For those who are not familiar with the color of light, we compare it to temperature. 5000K is supposed to be full white, and as it gets lower, it becomes more yellow and ends up in orange, and as it gets higher, it becomes whiter and ends up in blue. Halogen bulbs are the bulbs that cars have been using for years, essentially they have a wire inside that heats up and produces light. The heating always produces light in an orange/yellow shade. These specific bulbs are coated with a special blue shade, as seen in the photos, to convert this phenomenon and make the light they produce have the shade you want (4000K, 4500K, 5000K, etc.). That's why many people write in the comments that it yellows a bit and is not completely white (5000K) because halogen bulbs work this way. Therefore, logically, it yellows a bit, but as I said in the review, it only appears when you're driving, the bulb itself, at least to me, appears completely white.
Now, for those who want a pure white light or even a bluish tint, they need to look for LED/XENON bulbs where the shade in Kelvin is more realistic (especially for LED). Also, choosing LED/XENON means definitely brighter light than halogen! But for those interested in this option, they should know that in most cars that do not have LED lights on their own, an adapter will be needed to install them (either LED or xenon), which means extra money + installation at an electrician's shop. The cost is definitely double!
I paid 30 euros for halogen bulbs for the medium/high beam and I got relatively more expensive halogen bulbs that are of good brand (Philips). If I had bought LED or xenon, we're talking about definitely double the price, and that's for the cheaper brands. For example, if I had bought Philips LED H7, it would have been around 100 euros, which is more than double.