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<blockquote data-quote="Fred Kingston_RIP" data-source="post: 805780" data-attributes="member: 10742"><p>If you dig into those power numbers, the biggest differences aren't related to how much light is output, but rather, the duration of the light... Most folks, in a studio situation find it easier to lock down exposure settings... ISO, speed and aperture, as well as the light's settings... and then incrementally, physically, move the light either closer or further from the subject... At full power, the light's duration is at its slowest... and at its lowest power setting, the duration is at its fastest... You don't need a large range of light-out because you can move the light closer or farther away... However, if you're doing high-speed syncing, you want that range reflected in light duration... An example would be a setup with dripping water... At full power, the duration might cause motion blur or might not be fast enough to freeze drops of water falling, whereas a lower power setting will be at the light's fastest duration and freeze the drops of water...&nbsp; This all relates back to the laws of reciprocity within the design constraints of how strobe/flash lights work... You're trying to lock in all the exposure settings, but changing the light's power setting affects the duration of light...</p></blockquote><p></p>

[QUOTE="Fred Kingston_RIP, post: 805780, member: 10742"] If you dig into those power numbers, the biggest differences aren't related to how much light is output, but rather, the duration of the light... Most folks, in a studio situation find it easier to lock down exposure settings... ISO, speed and aperture, as well as the light's settings... and then incrementally, physically, move the light either closer or further from the subject... At full power, the light's duration is at its slowest... and at its lowest power setting, the duration is at its fastest... You don't need a large range of light-out because you can move the light closer or farther away... However, if you're doing high-speed syncing, you want that range reflected in light duration... An example would be a setup with dripping water... At full power, the duration might cause motion blur or might not be fast enough to freeze drops of water falling, whereas a lower power setting will be at the light's fastest duration and freeze the drops of water... This all relates back to the laws of reciprocity within the design constraints of how strobe/flash lights work... You're trying to lock in all the exposure settings, but changing the light's power setting affects the duration of light... [/QUOTE]

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