Four different compact fluorescent bulbs and their comparison to incandescent bulbs are advertised as follows: a 42-W cfl produces the light of a 150-W incandescent,a 9-W cfl produces the light of a 40-W incandescent,a 23-W cfl produces the light of a 100-W incandescent,and a 13-W cfl produces the light of a 60-W incandescent.Which cfl produces the most light per watt,and which one produces the least? Assume true advertising!
A) the 13 W,the 42 W
B) the 9 W,the 23 W
C) the 23 W,the 42 W
D) the 42 W,the 13 W

Question

Quizplus · Accepted Answer

The 13-W CFL produces the light of a 60-W incandescent, giving it a ratio of 60/13 ≈ 4.62 lumens per watt, which is the highest. The 42-W CFL produces the light of a 150-W incandescent, giving it a ratio of 150/42 ≈ 3.57 lumens per watt, which is the lowest.

Four Different Compact Fluorescent Bulbs and Their Comparison to Incandescent