I bought my MBP 17" from the states last year September. I obviously had to get a power converter so the charger plugs in over in here, but I was wondering (now I'm not a technical person at all so feel free to laugh at me for being stupid) but does the converter limit the amount of power coming through? I only ask because sometimes with my display, I always think that sometimes it should be a lot brighter (I have a matte display).