Not told off but probably corrected, because the H7 headlight is far better than the H4 on dipped beam with standard bulbs. This is because the H7 dipped reflector produces a much better spread of light as it is only trying to do the one job.I get told off for daring to say that the H7 type headlight on the T6 is no better than the H4 on dip with standard lamps fitted
you then hear it's better when you fit non standard lamps or code main beam and dip to run at the same time on the H7 which I think is probably true but a next to useless advantage 90% of the time
Coding the H7 is nothing unusual or magic, it’s just making them work as designed and how they work when fitted as standard. Having specific, focussed high beam lenses with the power of a second set of bulbs (standard ones) gives vastly improved performance when using high beam (percentage of high beam use is purely personal depending where you live).
My H7s cost £70 (including bulbs) and fitted with CE approved standard halogen bulbs not only give very good performance, but are also fully legal and cost similar to the H4 LED or HID bulbs you mention. Obviously they would be even brighter with non road-legal bulbs but some people maybe prefer to stay legal and MOT compliant.
Personally I am very happy with my H7s. They are far better than the H4s I had before on both dipped and high beam. They are not a million miles behind the performance of the OEM bi-LED swivelling headlamps on my Passat. I also prefer the look of the DRL. Each to their own, but the H7s will always outperform the H4s with like for like bulbs because of physics.
I’ve found these (and other similar) only make a tiny difference. Unfortunately they don’t last very long, about a year in my experience, meaning regular replacement.Osram Nightbreakers, 20 quid, sorted.