I recently swapped out my old fog lights for the RCJ H4 9003/HB2 bulbs, and I'm really impressed with the difference they've made. The 6000K cool white light is super bright, making my fog lights much clearer and more effective when driving through fog or rainy conditions. It really improves visibility, and it looks way cleaner and more modern than the yellowish stock bulbs.Installation was a breeze these bulbs are plug and play, so I didn't need any fancy tools or complicated instructions. They fit right into my existing fog light housings with no issues at all.I also love the durability factor. The IP67 rating means they're resistant to dust and water, so I'm not worried about them getting damaged in wet weather or after a few washes. They're holding up really well so far, and I've had no issues with flickering or dimming.If you're looking to upgrade your fog lights for better visibility and a sleek look, these bulbs are a solid choice. The pack of two gives you a great value, and they're performing way better than my old ones. Highly recommend!