"for the same wastage which lamp is cheapest"
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Answer:
GLS lamps
Explanation:
but it is the least efficient it is only about 5% of the electrical energy is converted into visible light for example a 20 -watt energy efficient lamp will give to same light output as a 100- watt GLS lamp an. 11- watt energy efficient lamp is equivalent to a 60- watt GLS lamp
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