There is a fundamental difference between a dongle and an interface.
uDMX is an Interface and not a dongle
A dongle is a software protection device and basically helps the developer to get money for the work they are doing.
Some manufacturers combine their interface with a dongle.
I did not meant it personally.
I just wonder were in this time of accessible data all this wrong information coming from. ;-) You are trying to get knowledge and this is absolutely fine.
Sorry that I can not identify this lighting instrument but I am not in my office right now.
I am always stunned by postings like this.
What makes you think this lantern is called a PAR?
Actually it is a PC lantern. PC stands for plano convex (pebble convex, prism convex) and describes the form of the lens.
I had to deal with a lot of mirror walls on stage in my life.
Therefor I would go with a colour that goes with the design of the venue, maybe a little darker to compensate the desk lights and the light emanating from the console monitors.