On regular zip cord, the smooth side is the Hot, and the ribbed side is the neutral.

If you follow the smooth side to the plug, it is the narrow prong. Wide prong is the neutral. Narrow=hot, wide=neutral.

A better approach is to use building wire from the lampholder in the cage out through the back. Then use a small electrical box where you wire on the cord with plug. You can get plastic wire channel to hide the wires in the cage. This way you never have to replace the wires from the lampholder even when replacing the plug or if you decide to wire 2 or more lampholders onto a single plug you can do so at the electrical box. Building wire is rated for much higher temps, and some bulbs can heat the wire quite a bit.
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Mark

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