Electrician and Wireman Light and Illumination Illumination

A 250 V lamp has a total flux of 3000 lumens and takes a current of 0.8 ampere from 250 V mains. Its luminous efficiency is

1
12 lumens per watt 
2
9.6 lumens per watt
3
15 lumens per watt
4
240 lumens per watt
5
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