What voltage goes through the Molex connector? (12v)
12v and 5v
What voltage goes through the 3-pin fan connector?
Anyone know a 3-pin UV light and 3-pin red light?
Just rip the molex off the cathodes and re-wire them with the connector you need. You can grab the 3-Pin fan connectors from Maplins and you'll only need to wire up two of the pins for +12v power.
Hope that helps