Total cost per 100 hrs of operation?
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The "Cost to operate (life span)" row takes into account how much it would cost to have the light on for the expected life of the bulb, the "Average life (hours)" row. Then the total operating cost calculates how much it cost to have the light on plus the cost of the bulb, in addition to any replacements for the longest life listed which is 25,000 hours.
For instance the CFL bulb has an average life of 8,000 hrs compared to the 25,000 hrs for the LED. So you would need to replace the CFL at least 3 times.