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Found a problem today: LabView control of the lights doesn't work. The relays work fine, but as soon as an LED driver is plugged in, it causes LabView to become unresponsive.
As I'm using cheap maxwellen drivers, I suspect that they are causing EMI issues which the relays are not entirely isolating from the arduino. I might borrow an oscilloscope from work to check it out, but I can't really think of any other reasons why other loads work on the exact same circuit while the LED drivers don't.
I've got 2 options. First, I could replace the drivers with better quality drivers. Second, I could use in-line low pass filters. As I've got a bunch of components lying around, I might try the second and install a LPF on one of the arduino digital controls and see if that solves the problem.
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