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in Utilization of electrical energy by
 In HPSV lamps, traces of neon gas 

 (a) Helps in stabilizing the arc (b) Changes the colour of light (c) Prevents the vaporization of filament (d) Assists during starting to develop enough heat to vaporize sodium

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 In HPSV lamps, traces of neon gas Assists during starting to develop enough heat to vaporize sodium

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