weiXuan DE3175 31mm LED Bulb, DE3022 DE3021 3175 LED Festoon Bulb for Car Interior Dome Reading Map Trucks Light 12V (31MM, Warm White) 4PCS

I really hate 'blue' LEDs - 'daylight', 'cool', whatever you want to call them, I find them very unpleasant for lighting interior spaces. Some previous owner had replaced the incandescent festoon bulbs in my car with some intensely bright, non-dimming, blue-toned LEDs. They were also bedecked with enormous heat-sinks, and still managed to get incredibly hot.I was pretty pleased to find this listing, and I tried a batch. So far, so good. They all lit well, the color was a vast improvement, and they dim pretty well (but not as smoothly or naturally as an incandescent bulb, to be fair).A word of warning, however: When I put them in at first, I paid little attention to how I did it (other than to get them the right way 'round - end-for-end - they are polarized and only work one way). I was bothered that they appeared to not only vary in color temperature (from quite warm, to middle-of-the-road, perhaps 2700k to 3200k?) but also in brightness/intensity. I was a little disappointed.Then when I was putting the last one it, I rotated it in the socket as I was trying to get it to snap... and I noticed that the light is not the same around all 360 degrees of the bulb. Apparently the "filaments" have the micro-LEDs down a single side, while they have the yellow phosphor coating (that makes the light more even and warmer) all the way around. As you spin them in their sockets you will notice a brighter side and a dimmer side (not a lot, but a bit), and the apparently color is different too.I don't find it a problem. You can rotate them so that they all look the same. One might even see it as a benefit, since you can sort of use that rotation to fine tune the brightness and color (but only together, not separately) of the bulbs. I would certainly buy them again.

Installed them in my 1973 car. They stop the plastic lens from getting too hot and deforming

These are a nice cool white and emit light in 360 degrees, unlike other directional LEDs, so it doesn't matter how you install them. My car had cool white DRLs and xenon headlights, but yellow-incandescent puddle and license plate lamps. Now everything matches.

I've been using these bulbs for quite some time now as my primary license plate lights on my vehicle. I ordered a set recently and found that there have been some manufacturing changes which cause these lights to fail and could result in a fire. To be clear, the previous version lasted over a year as a plate light and are continuing to function on other vehicles. I prefer the LED warm white bulbs as they look OEM and keep the temperatures and voltage down. If you keep your vehicles for a while and you do your own maintenance, you know that a hot bulb will damage plastic housings after a while.After installing the replacement bulb, I noticed it stopped working after only a few hours. I figured it was just a bad bulb and replaced it the next day. Again, the same issue occurred, and I noticed that bulb was out also. When I went to install the third, I found that it had failed after only a few hours. I took all of the failed bulbs and returned them. I assumed there was a defect with that set, so I ordered another pack. Once those arrived, I took a few apart along with one of the older bulbs that had lasted over a year. The differences were clear.First issue with the new set is that they are now using a different resistor. This resistor gets extremely hot and actually melts the outside tube. You can see in the assembled comparative photo that the top (newer) bulb looks smaller. It appears this way because the heat is melting the tube and causing it to shrink which is what is ultimately causing the failure. The heat melts the tube which causes it to shrink under the spring tension in the housing and eventually disconnects itself from the circuit. Luckily this did not cause a fire or any other damage to my vehicle.In the disassembled bulbs, we can see the newer version is on top and the older version is on the bottom. It appears they've upgraded the "filament" LED portion to a thicker and seemingly stronger component. Unfortunately the resistor is an incorrect match. Maybe they did this to save space in the smaller 36mm housing? Unsure.I ordered the older style / rating resistors and installed them in the surviving bulbs which seems to work. You can find them here on Amazon as "E-Projects 25EP514680R 680 Ohm Resistors, 1/4 W, 5% (Pack of 25)". If you're handy with a soldering iron you will be able to replace them fairly quickly as the end caps on the bulbs are simply pressed on.Very disappointed as these little lights are perfect for the application, and now are simply unusable without taking them apart and modifying them. Hopefully they rectify this issue in the future and go back to the original components.

I bought these as a replacement because my passengers kept leaving the dome lights on and wearing down my car battery. Unlike most LED bulbs on the I found on the market, these are NOT super bright, but seem to be made to be more or less equivalent to the brightness or regular dome light bulbs. In the picture, the LED is on the right. Seems to have a slightly lower color temperature than the 8W incandescent and was perhaps slightly dimmer. But as these may end up in use while driving at night, I am not sure I would suggest something brighter in the first place.Bulbs were slightly longer than the originals, but I was able to insert them without too much effort. Polarity is not indicated, but all I had to do was reverse the orientation and they worked fine.Bulb pulls 40 mA, compared to 540 mA with the OEM bulb, so I suppose they should last at least 13 times as long.