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[OM] Re: Lighting an airship? was Re: Re: Flash for E500

Subject: [OM] Re: Lighting an airship? was Re: Re: Flash for E500
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Sat, 17 Nov 2007 16:50:27 -0500
Ok, thanks.  Power storage capacity vs. what gets delivered to the 
subject 10 feet away.

Chuck Norcutt

Tim Hughes wrote:
>>> how do you know that<<
> Chuck,
>       From calculation, knowing the voltage and capacitance.
> 
> There are some very old threads where I listed a comparison of relative 
> efficiency in a range of
> common Sunpak ,oly,metz etc flashes with compared normalised GN's, normalised 
> for nominal areal
> coverage and energy. To do it properly you would need to integarate light 
> output with an
> integrating sphere to get BCPS etc rather than rely on assumed similar light 
> pattern uniformity
> from different flash vendors. 
> 
> T20's are a lot less efficient than T32's.  
> 
> Tim Hughes
> 
> --- Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx> wrote:
> 
>> Thanks and how do you know that?
>>
>> Dr. Flash
>>
>> Tim Hughes wrote:
>>> Chuck,
>>>        The T32's are actually 70J. 
>>> Studio units tend to waste the light produced a bit more (reflectors less 
>>> effective) and also
>> with
>>> larger tubes the lamp conversion efficiency is a little lower.
>>>
>>> Tim Hughes
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> 
> 
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> 

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