For the same wattage, which of the following lamp is cheapest?

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Mr. Dubey

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Q. For the same wattage, which of the following lamp is cheapest?

(A) Mercury vapour lamp
(B) Fluorescent tube 4 ft.
(C) Fluorescent tube 2 ft.
(D) GLS lamp

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✅ Correct Answer: (D) GLS lamp

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