Maybe it would be good to take some ferrite rings if you've got them. If the problem is RF from the LEDs, ferrites could block them from getting out of the LED fixtures and onto the power wiring.
You really should contact Brent about this before you go. He might have some suggestions about HDMI snow and what makes it happen. You might be able to save yourself a trip if you know some of that stuff ahead of time.
A good answer is easier with a clear question giving the make and model of everything. "The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
