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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: Tim Hughes <timhughes@xxxxxxxx>
Date: Fri, 16 Nov 2007 21:13:50 -0800 (PST)
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

--- Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx> wrote:

> I'm afraid I can't help you with guide numbers for monster flash units 
> but a T-32 has approximately 100 watt seconds... at least by metered 
> comparision between T-32s and a Lumedyne flash head with a 50-100-200 
> watt second power pack.  At the 100 watt second setting the Lumedyne and 
> T-32 are within 0.1 stop of each other at both the center of the field 
> and the edge of a 28mm field of view where both flashes fall off 1/2 
> stop.  I'd call them dead even since the 0.1 stop differential is less 
> than the differences between multiple T-32s.  But all four of my T-32s 
> are within 1/3 stop of each other.
> 
> My Alien Bee B-800's which are supposed to be 320 watt seconds only just 
> match the Lumedyne at the 200 watt seconds setting or the output from 
> two T-32s.  They also fall off 1/2 stop at the edge of a 28mm field of 
> view.  It's quite possible that the B-400 (advertised as 160 watt 
> seconds) is no more powerful than a T-32.  I think watt seconds is 
> fraught with to much market speak to know what is real.  But my flash 
> meter, he don't lie.
> 
> Dr. Flash
> 
> 
> usher99@xxxxxxx wrote:
> > Perhaps not a great question for Dr. No-Flash, though wonder if there
> > is any ballpark relationship is available for the energy? stored in
> > the monster flash capacitors and GN---if the later is even meaningful
> > with these things. One would have to specify the set-up. ?
> > Conversely, how many w-s in a T32? Mike
> > 
> >
> 
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