Exactly my point, it’s based against the minimum legal requirement and tested in a lab with set parameters. Actual results will vary wildly depending on headlamp design and condition, let alone what the existing bulbs are. The Phillips GT200 bulbs are regarded/tested as the best performing so unless the OP already has them fitted he will see an improvement. Just not a 200% one (or anything near)!200% brighter than what? The claimed % increase is above the minimum requirement for lamps. It could be that regular lamps that come fitted from the factory are "150% brighter" than the minimum, so the super duper shiny packaged uprated lamps aren't going to be all that much of an improvement.