1. The problem statement, all variables and given/known data 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. Relevant 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.
In europe, the number of Lumen will be present on the box. I Have 2 boxes here that say: 230 V, 60 W, 710 Lumen 230 V, 100 W, 1340 Lumen Kind of bulb: "Pearl" so I don't think there is any calculation involved. I'd try to get some more datapoints