I use Armacost lights with it and less than half of my connections worked on the first try. I had to push the copper connection points a bit and/or wiggle the connection to make it work. It wasn't a very fun project because I had to diagnose (every time) which end of the cable was not connected. I think it would be easier with a voltage tester. In any case, it was VERY lucky when they worked. One arrived broken. The only benefit is that they are (theoretically) reusable and small so they fit in a metal duct if you choose to mount them that way.
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