578 LED Festoon Bulb, 42mm 41mm 1.65 Inch Festoon DE3425 DE3423 211-2 LED, 12V 33SMD White Light 42mm Festoon Bulbs for Car Interior Dome Map Courtesy Trunk Light 212-2 Led, 4pcs

Very good replacement for tungsten lamps. Much brighter and lower power consumption.

They’re very bright and work well. Used them as interior lights for Suzuki Vitara and, while a little bit wider than the old ones, they fit well.The soft on/off dimming works well.Great value for the money, it was one of the cheaper kits I bought and they’re the brightest ones. Will see how long they will last.

Good quality bulbs

These festoon 578 bulbs are a great upgrade—much brighter than the stock ones and they give the interior a cleaner, more modern look. The build quality seems solid right out of the box. I haven’t had any CANBUS errors on my 2008 Freelander 2, which is always a relief with LED swaps. Longevity is still a question mark, but since it’s a multi-pack, I’ve got backups if needed. Overall, a good value and a noticeable improvement.

Replaced rear passenger light on my car. Very bright although more bright white than warm white which is the colour of the interior lights of my car. Nevertheless, doing a good job.

Item came next day. 'Bulb' was to replace my MX-5 interior light and it was perfect. Can't comment on longevity, but I have 4 in anycase 😄

These 31mm DE3175 LED Festoon Bulbs, are very well made with a good electronic architecture: each of the 21 individual LEDs are fed with a constant current sourced by integrated circuits.They give a bright white light, which has transformed the cabin lighting of my Nissan X-Trail 4x4. They also take around one tenth of the current of the standard filament bulbs. This is an important feature when you use the cabin lights for long periods without the engine running, for example when camping.Highly recommendedNB: There are two types of festoon bulb holders: end clip and side clip. These LED festoon bulbs will fit end clip holders without problem. But, as there is an aluminium heatsink along the back of the LED bank, there is a danger that side clips will contact the heatsink and blow a fuse.So, in the case of a side clip holder, carefully check that the contact clips, at both ends of the holder, are not touching the LED heatsink. In an extreme case, you may need to carefully file away some metal from the clips facing the LED(It would be highly advantageous if the this festoon LED manufacturer could embody insulating bushes at each end of the heatsink to prevent possible contact with side clips: the heatsinks are anodised, but that is not considered to be sufficient)

OK item. Some of the pack bend under pressure being fitted between the 2 sprung metal connectors in the light fitment. Those that bend drop out and I had one end cap break off. The working ones are really bright giving a nice mid-cold light temperature. No canbus problems experienced. Definite improvement from the original filament encased in glass bulbs.If you are lucky and get 4 that dont bed and break, good value - mine not quite that