I have tried the high wattage bulbs in the past but not on the 126, the result were disappointing the light was fuzzy, you loose the definition of the lens compared with a 60/55w bulb by that i mean with a standard bulb you can see the straight line with the upstand on the LHS which was lost with the 90/100w bulbs

besides i think there illegal for road use?
I recently bought some H4 bulbs 60/55w Philips X-Treme there a bit pricey but noticeably brighter than the cheap p45t on ebay