Choose the correct order of electric discharge lamps in their increasing order of efficiencies (lumens/watt) : 

(A) Sodium vapour lamp, Mercury vapour lamp, Neon lamp 

(B) Neon lamp, Sodium vapour lamp, Mercury vapour lamp 

(C) Neon lamp, Mercury vapour lamp, Sodium vapour lamp 

(D) Mercury vapour lamp, Sodium vapour lamp, Neon lamp
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Choose the correct order of electric discharge lamps in their increasing order of efficiencies (lumens/watt) : 

(A) Sodium vapour lamp, Mercury vapour lamp, Neon lamp 

(B) Neon lamp, Sodium vapour lamp, Mercury vapour lamp 

(C) Neon lamp, Mercury vapour lamp, Sodium vapour lamp 

(D) Mercury vapour lamp, Sodium vapour lamp, Neon lamp

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