Previously I was using Philips Xtreme vision H4, same wattage as stock bulb so direct replacement without any extra relay or wire cut. I was satisfied with light it was producing on highway and in City area. Both the bulbs were gone kaput after ~1.5 years. So this time I had bought Philips Xtreme vision+ (plus). I have not find much difference within city area than the previous regular xtreme vision. However I have not yet tried these bulbs on highway. I also don't like white light so for me it is more than enough.