The article compared different ways of measuring how well a solar panel converts sunlight into usable energy. By looking at factors like the environment and how the panel is designed and used, the researchers calculated how efficient the solar panel was in different scenarios. They found that the efficiency of the solar panel varied between about 9% to almost 20% depending on the method used to measure it. One method even included how well the panel turned sunlight into electricity. Overall, the study showed that the efficiency of solar panels can be measured in various ways, each providing slightly different results.