Review on 🔦 Enhanced Visibility: D-Lumina 3156 3157 LED Backup Reverse Light Bulbs - Powerful 5600 Lumens, Improved 21W 2-SMD CSP Chips for Various Models 3056 3057 3457 4157 - Canbus Error Free, Easy Plug & Play, Crisp 6000K White (Pack of 2) by Jamie Behm

First 24 hour review. The lamps look great right out of the box. The included o-rings are a nice touch, I think there are 4 of them in case you need to break them or fold them in half, but I only needed 2. In my 2018 Mazda 3 GT Hatch they were originally snug but added one Added o-ring ring to be safe. The rubber bushing is glued to the cooler. They seem pretty solid and the heatsink is beveled so I don't cut my hand pushing it in. They say they have a 5 year warranty and are waterproof but I haven't tested them in a glass of water lol. They seem to be polarity sensitive so I just matched them to the metal tabs on the bracket. They protruded a little at the back, but I was still able to put the lids back on. My main complaint, for which I deducted a star, is that the heatsinks got quite warm after leaving them on for about 45 seconds, and then cooled down after about the same time. I don't really plan on going backwards for that long, but it might be something to watch out for. I personally rotated them to a vertical position to get the best light output in my application.