If your headlights are adjusted properly, the low beam will not blind oncoming drivers even with 100 watt bulbs. Use a Bosch standard relay to power low beams and high beams separately. A 20 amp inline fuse for each relay will complete the job.

I like to use SEV Marchal Ampilux H-1 headlights. Alas, they haven't been made since Cibie bought the headlight division. Anyone knowing the whereabouts of any Ampilux headlights, please PM me.