BJHenry:
Sure, you'd use PNP transistors (or P channel MOSFET) to switch the 12V supply going to each LED light, instead of switching the common ground.
Yes, I wondered about this. I am using an NPN MOSFET. That makes sense to me to change to a PNP. I might try to draw up a circuit and would welcome any feedback but I get this now. It is basically the reverse of what I tried... Sorry if it seemed like a stupid question....Just learning this hobby.... Thanks!