i suggest you to use either Philips rally 90/100 Watts H4 tubes or Osram 80/100 Watts rally tubes.
i would recommend Osram as being long life and good visibility, Philips rally has lesser life, but plz make sure to get the original ones.
i remember there was one pakwheeler/ i guess Babar Khan in karachi dealing with original bulbs, i had good experience with him in past.
Night Vision/Extreme vision and other variants are two expensive and lesser cost to benefit ratio.
the ready made plug in play relay kits are available on Montgomery road to safeguard against headlight switch damage or any warranty issues.