True and Effective watt seconds

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Submitted By: ScottAlan

Location: East Texas

Joined: Apr 15 2005

Posts:

True and Effective watt seconds

Posted: April 15, 2005 - 7:10am

I was wondering what the difference is between true watt seconds and effective watt seconds... If anyone knows please respond....

Thanks,
Scott

Submitted By: Anonymous

Re: True and Effective watt seconds

Posted: May 23, 2005 - 12:52pm

Different flashes of the same nominal output (in Watt-seconds) produce different amounts of light.

True Watt-seconds are the actual power.

Effective Watt-seconds are what the manufacturer thinks his flash is equivalent to, usually as compared with the least efficient unit on the market. Thus, if my 400 W-s unit delivers twice as much light as the worst 400 W-s unit on the market, I call it '800 equivalent W-s'

Cheers,

Roger W. Hicks (www.rogerandfrances.com)