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**1. Homework Statement**

Which is more efficient, or has the highest lm/W, a lower- or higher-power light bulb? To find out, look at bulbs and record the power and lumens.

**2. Homework Equations**

Lumen, lm, = P or luminous flux.

**3. The Attempt at a Solution**

Power of the light bulbs would be the number of watts, correct?

I am confused as to how to calculate the lumens of a light bulb. My teacher said that we can just look at bulb boxes at a store, so I know no measuring of surfaces is involved.

Thanks in advance.