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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