Not seeing it I can't know for sure but most light bulbs polarity makes no difference. I played around with a mini screw in fluorescence bulb before posting this and it worked fine and drew the same amps regardless of polarity. Regular incandescent bulb absolutely work this way. As log as the current crosses the element you'll have light.
BTW- the skinny post on a plug in is usually hot and the wide one is ground or neutral. White's usually ground and blacks usually hot in households in the US.
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