I may not understand your question.
Yes you can change the actual bulbs. I highly doubt that the actual bulb is your problem though. The light assembly reflective surface or the outer lens is your problem. Changing the actual bulb or the light source is not going to help you.
To change the bulbs, look behind the headlight light. There is an electrical connector, a big black plastic circle that twists off and probably a small metal clip. The bulb is behind all of that.