Review on Kairiyard H4 9003 HB2 Led Headlight Bulbs - 55W 9000LM 6000K White - 400% Super 🔦 Brighter H4 LED Headlights Conversion Kit - High/Low Beam Fog Bulb - IP65 Waterproof - 2 Packs by Timothy Weems

This isn't my first rodeo so I'll start with what didn't work out. If you've tried installing LEDs on DRLs (Daytime Running Lights), you'll see flickering. This is due to the low voltage that the daytime running lights use. This isn't a problem when you're using the high beams, but it becomes very annoying when you're not. Since an updated driver was installed here, after a few seconds of plugging in, this was no longer a problem. In the past I've had to use a relay to provide power directly from the battery, but this will work on its own if plugged into an existing connector. One thing I found out is if the bulb doesn't work you have to reverse the connection. I think it has something to do with positive and negative links. All in all I couldn't be happier. Fingers crossed, hope this lasts!