>>292390459
This is wrong. Lighthouses are "dumb" sensors that send out an IR field. This is picked up by the tracking points on your pucks/ controllers/ headset, and the transform in space is computed from that data. 

>>292390979
You could use the controllers as pseudo tracking pucks apparently? Not sure how you would set this up from a software and hardware side, but it's an option if you want to save $100 or so. 
You need to have some USB dongles, one for each puck, plugged in the computer but beyond what you mentioned that's it for cables. Recalibrating isn't that much of a faff but it can be annoying to do when you're smashed.
t. Recently set up hybrid.