Determine the illumination from a 60 W (645 lm) light bulb.

A very simple task. We get the answer in one action: you need to divide the larger value by the smaller one. 645/60 = 10.75 watts. If we use the appropriate source of information, then we will find out that the light bulb is LED. But the power value is slightly overestimated, if we take the light flux close to ours, i.e. 650, then the correct power should be 8 watts. In our problem, the answer is 10.75 W.