Hi, just for information!
I am using my older SONY HDCAM Cameras HDW-650P and HDW-730S für multicamera shoots.
I checked the D-Tap Ligh Port and surprise, surprise ... its regulated to 12V.
So i am save to conntect my VAssists 4K directly to the ligh-port.
Before you conntct, take the time and a voltage-meter to check!
But it may also be regulated on the HDW-750, 790 ... and od the PDW-700, 800 ...
All the best, Mike