As an example of independent testing, Auto Express do this annually in the UK and, if nothing else, it gives you some kind of statistical guidance as to which light bulbs work better that others and thus help you choose. It also will make a difference on how old your bulbs are - replacing virtually new bulbs may notice a difference but 6 year old ones will show a greater difference. Bit like a clean car drives smoother than a dirty one - the gap in smoothness or performance in direct correlation to the amount of effort you spent cleaning it yourself!
Headlamp bulbs tested | Products | Auto Express
2010 R36 (MY10.5), Biscay Blue, RNS510, MDI, Electric tailgate, sunroof, Superchips remap - SOLD
2016 Octavia VRS wagon, moon white, Tech Pack, 18" black pack, electric boot, panoramic sunroof, Bluefin
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