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Sun light is about 1kW/square meter.

A 737 has a wing area of 125 square meters. To deliver 7.5MW to those wings will need 60kW/square meter.

That's a far greater energy density.

As for "time in beam" of a moving beam. Presumably one end of the beam is fixed, and depending on the target's velocity the beam might not be moving much at all (oncoming plane).




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