now about the led input voltage...which i do think your right on saying that vin means voltage input......it does say that they are controlled by seperate BATTERIES inside the air gas processor....so the voltage i am unsure of as to what type of batteries he was using.....maybe jsuta simple 12 volt leds run by 4 AA??
(http://i2.photobucket.com/albums/y2/kinesisfilms/ionizerods.jpg)