Discussion
A 100 W filament lamp of efficacy 15 lm/W produces about
Answer: C
Correct answer: 1500 lm
\[ 100 \times 15 = 1500\ \mathrm{lm}. \] Efficacy multiplied by power gives flux, and the same 1,500 lumens would come from about 12.5 watts of a modern diode luminaire - which is the whole case for the replacement in one comparison.
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