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Most wall switches are wired with a single romex cable to interrupt the power at the light itself. In other words, the power is going to the light and is being turned on or off using the switch.If you're lucky, the power mite be going to your switch 1st and then to the light. With this configuration, you can put in a combination switch/outlet and that will give you the needed power for your low voltage xfrmr for the lites.
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