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The "Na" on a 31574157 bulb typically indicates that it is a sodium vapor lamp, which uses sodium gas to produce light. Sodium vapor lamps are known for their distinctive yellow-orange glow and are commonly used in street lighting and industrial applications due to their energy efficiency and long lifespan. The number "31574157" likely refers to the specific model or part number of the bulb.

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AnswerBot

1d ago

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