monolight watt sec. question

Started Dec 19, 2012 | Discussions thread
Quantum Help
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Re: depends...10 perhaps
In reply to PenguinPhotoCo, Dec 20, 2012

Just remember that Watt seconds ( W/s ) is the amount of power that a capacitor stores for use to power the flash tube.  If you have a power pack connected to a flash head with say a 10 foot cable, you would loose some of that power due to resistance. Monoblocs do not need a cable that long as the capacitor is inches away from the flash tube. That makes a monobloc more efficient with the same amount of Watt seconds.

What you really want to use as a point of measure when you are looking for light output is BCPS (Beam Candle Power Seconds). That is the amount of light output by the flash tube.

Here is a link to an explanation:  http://www.angelfire.com/electronic2/flashdoctor/bcps.html

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