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sodium-vapor lamp
so·di·um-va·por lamp (plural so·di·um-va·por lamps)


noun 
Definition:
 
orange-yellow electric lamp: an electric lamp containing neon gas and sodium vapor through which a current runs to produce an orange-yellow light used for street lighting
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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