Definition of sodium-vapor lamp
: an electric lamp that contains sodium vapor and electrodes between which a luminous discharge takes place and that is used especially for lighting highways
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“Sodium-vapor lamp.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sodium-vapor%20lamp. Accessed 22 Sep. 2021.
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The first known use of sodium-vapor lamp was in 1933
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