how do projectors work?
 

maybe a newb question.. but wutever

i see that our cars have 3 bulbs in each headlight stock. so each bulb has one plug each. now projectors have 4 bulbs?? how does the fourth bulb get its power?? wut size bulbs does the projectors use? diff size for high/low right?? im askin cuz i just bidded on some RS type Black projectors.. and today i just bought some PIAA h4.. i just hope i didnt wast 70 bux.. just to have to buy 2 more pair of bulbs in diff sizes for the projectors.

I am not sure about the projectors you are talking about, but when you buy projectors they come with bulbs. The bulbs they come with are not H4. They are different because they have a different bulb for the high beams. In the H4 application, has the low beams and high beams all in one bulb.

wutever bulb they come with.. it can be swapped out for another bulb? say swap them all out for PIAA extreme white?

yea you can do that, but your going to still need to stay with the original H3's that it came with,
you cant use PIAA H4's....you can use PIAA H3's, hope that helps