i disagree. light output is measured in lumens, not kelvin colour. the +50% bulbs give off more lumens than the standard bulbs. that is why they are legally brighter.
as an example, in this H7 test http://www.bmwtips.com/tipsntricks/Bulb/H7.htm
philips vision plus 1,590lumens
philips premium 1,498lumens
philips bluevision 1,409lumens
obviously a higher kelvin temperature colour such as that used on blue bulbs will drop the lumen output because lumens are the brightness as the human eye would see it, and the human eye doesnt pick up blue light very well. however it is always true that you can see more light from a higher lumen bulb, thats the whole point of lumens, so technically the vision plus bulbs are brighter and you do see more light and you can see better at night compared to the standard bulbs that have a lower lumen output yet also the same kelvin colour temperature.
The UNECE regulations state that the legal output for an H7 bulb at 12V is 1100 lumens +/-15%, with nominal values of 1500lm +/-10% @ 13,2V (car voltage). All H7 bulbs have to comply with this even if they are marketed as Vision Plus, +80% or whatever. The Osram catalogue states that their nominal output is 1500lm +/- 10% @ vehicle voltage, for all varieties including their Super, Silverstar, Cool Blue and AllSeason bulbs. So there is no difference in the nominal lumen output of any of their H7 bulbs, and all the values that you quote above for Philips bulbs would fall within this range. So yes they are legal, all the bulbs you quote would meet the 1500lm +/-10% criteria (I did not suggest that they weren't), but in no way do they emit more light than standard bulbs, certainly in no way do you get 50% more, let alone 80% (+/-6% is more like it).
I am fully aware of what unit light output is measured in and you are correct in stating lumens, however colour temperature is not a measure of light output, only of the colour of the light that the bulb emits. You can have two bulbs with exactly the same lumen output, but vastly different colour temperatures. That is the beauty of Lumen in that it accounts for the response of the eye
to colour. The whiter/bluer the light, the higher the colour temperature however your brain
perceives it as being brighter even though it may be exactly the same lumen output.
This is to do with the way the brain percieves saturation. Any colour when at a high enough intensity will appear to be white as the colour receptors in the eye saturate. Hence, when the brain 'sees' light of a higher colour temperature it 'perceives' it as being of higher intensity compared to a lower colour temperature source because the brain 'assumes' the colour is more saturated and hence more intense.
You are correct in your statement that you will always see better with more lumens, and as all H7 bulbs have essentially the same lumen output you will not see any better with any particular version. You will only perceive a difference based on the colour temperature.
I hope this helps to clear up any missunderstandings.