Divide the light current into the power supply current will give you how many you can typically operate kind of.
The reason for the stud plates is keeping the wires from being penetrated. drywallers sometimes use other fasteners like 8 penny galvies because they are lying around in a 25# box. Drywall nails and screws are typically only 1 1/2" long so you dont penetrate the stud center. I've seen where a sheetrocker got his sheetrocked room ripped out looking for the nailed romex.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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