One other thing, byproduct of more wattage is heat as well as light, but the 80/100W bulb is using 20% more of both, the headlight glass lens assembly sheds heat by air movement, so in practice the heat dissipation is managed quite well. Also remember that normally high beam (100W) is only when moving, with frontal illuminated area clear hopefully very far up the road to avoid blinding oncoming traffic.