I fitted "Xenon Style" H4 headlight bulbs to my car some years ago, was very impressed with the illumination but the bulbs didn't last much longer than a year. (H4, dip and high beam on one bulb)
Later I changed car and had proper Xenon gas discharge dipped beam but halogen H7 high beam. High beam was mediocre but dipped beam was good, although I recall that the the forward light penetration seemed inferior to the previous car.
I now drive a car with full LED high and low beam. High beam is like having floodlights, use with care as it will annoy traffic travelling in either direction some distance way in front, and with low beam illumination close in front is very good, but again I feel lacks sufficient forward penetration. (Aim has been checked, it's not too low). Perhaps my memory of the car two cars back spoils me. However, when driving Mrs S's car with H4 normal headlamp bulbs, I think her car has candles for headlights, close to being dangerous on unlit roads.
I must be honest and add that I don't find LED headlamps from on-coming traffic annoying - but do find the dayglow running daylights annoying when used in low light, likewise drivers who forget (or don't consider) that in many cars day running lamps do not extend to rear lights so are effectively driving with no rear lights in poor light.
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