The output of our transformer is 120watts max. Our Halogen bulbs are 20watt each. You can also use LEDs; ours are PowerLED 4.5 watt each.
The transformers do need to be isolated from each other.
The user has the option at the time of installing the picture rail whether or not to connect the internal 12v strip to the next rail. This gives maximum flexibility when using multiple transformers.
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