To learn the basics, and even if I may sound like a know-it-all, I have paid dearly for what I know: they DO NOT work for fog lights or rain, just like any cold-temperature light, whether halogen like this one, or LED/Xenon, etc. Quite simply, the wavelength in the fog of moisture and even worse in the rain does not let them illuminate. To get to the point, apart from the power, which is nothing special, they are only for the posers who turn them on during the day, a new fashion this, so the car will look nice, they say (and when there is fog they NEVER turn them on! maybe because they tried it and got scared?). If you are of a certain age, you will remember the lights of mainly French cars with yellow bulbs that excelled in fog. Today, only halogens with a warm color of 3000-3500 Kelvin at most do the job; LEDs at the same Kelvins are useless because of their nature... so I went back to upgraded halogens.

Certain bulbs burned out the same day I installed them, I don't know what the problem is but I will never buy them again

The light has no intensity at all, better to use regular bulbs... as soon as I installed them in the car, I immediately took them out, disappointing the light they have, I couldn't see at all at night

For halogen, I believe it is indeed at the 5k that they state, however, the intensity of the light is at very bad levels, worse than (genuine). They were removed and replaced with LED...

Apart from the color, which is very close to LED, I wouldn't buy them as lighting because I think they are worse than the yellow ones that the car had. In theory, on a large scale, the lights should almost double the length of the beam and increase the width by about 1 meter. With these, and in combination with the corresponding H7 ones I have on the middle scale, when I open the large scale, the beam only increases by a maximum of 3 meters.

For their price, I consider them the best you can get if you don't want to deal with LED or xenon. The intensity is satisfactory, especially in dark conditions with poor or nonexistent lighting. The color is indeed 5000K, you can compare it to fog lights that are around 6000K LED

These specific bulbs are worth their money. In other words, if you don't want to spend 100 euros for an LED kit, these bulbs are the best solution. The only negative thing I can say is that they work at 100% capacity in complete darkness. So around 8 or 9 in the summer, you won't see a significant difference on the road, which can be tiring, but in total darkness, they do a very good job. I have had them for a year and I see that they work very well. As for durability, everything is fine for now. They are worth their money for a more economical solution