You're stuck with either using slightly brighter but legal Osram Night Breakers, or Philips extreme vision. Both claim 150% increase in brightness, but in reality they are only slightly brighter, and a bit whiter. I've use both in my cars for years, as every little bit of extra light is a good thing.
Several people have fitted HID conversions, which are a lot brighter, but not actually legal, so can fail the MOT.
Oh and just to make things interesting, the bulbs (they're actually lamps, bulbs go in the garden
) are known under 2 different names. They're 9005 or HB3, both are identical, just different manufacturers choose to call them different names.