Do not use any other bulbs power than stock unless you add relays!!!

While plus is supplied through relay, the ground wire is going to the dimmer under the steering wheel, so the contacts on the dimmer will quickly blow out, especially when you switch from low to high beam frequently. By installing additional relay instead of the lamp you can improve also the output from the stock bulbs because of the voltage is dropped on the long wire to the steering wheel and back to the ground.