The higher the number more powerful the flash, some offer zoom heads so can double or more their widest GN
The GN was used as a means of calculating exposure for any given ISO, distance, and power setting in the old 'manual' days
You don't need massive power to shoot most things, but a very powerful gun used at 1/2, 1/4, 1/16th setting recycles a lot faster than a lower powered on at full power
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