Thank you for the response! and apologies for the picture sizing. I have been a member of the forum for a while now, but was unaware of the sizing limit until now.
Why not power FETs
I extrapolated from this post: http://forum.arduino.cc/index.php/topic,68200.0.html, that high current consuming LEDs should be PWMed with a driver.
Do they have a driver in them already?
It is my belief that the transformer in my system also contains a LED driver but since the system is modular the connection between the transformer and LEDs can be easily disconnected (it is at this location where I would like to add a LED PWM-Capable Driver).