Considering the total heat losses fromall fluorescent lamps

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Considering the total heat losses fromall fluorescent lamps to be 79%, the Heating load (Btu/hr) due to office illumination with 48 ceiling mounted luminaires, each containing four 40 W fluorescent lamps and flat surface diffusers will be

1. 10000 Btu/hr
2. 15000 Btu/hr
3. 17500 Btu/hr
4. 21000 Btu/hr

Correct Option: B

Heating load = 48 × 4 × 40/(3.41 × 0.79)