Right then, installed the Philips 150+ racing vision H4 bulbs. Been out for a drive and honestly I think the improvement is significant.
Previously, it was hard to tell on totally dark roads if the lights were on. If another car approached or if there were any street lighting you couldn't see if the lights were on at all!
Now, I'm seeing more of the road and can actually make out the road surface a lot better. When driving in lit up roads I'm still seeing where my lights are shining. I certainly think the white light is a big help, but they are definitely brighter and I feel a lot more confident with the thought of driving at night.
Here are a few pics, just off my iPhone 6 but I think it should at least give you an idea.
STD Bulb, low beam focused down:
150+ Low beam focused down:
STD bulb low Beam focused up:
150+ Low beam focused up:
150+ low beam
150+ low beam plus fogs