P3D Re: Pro studio lighting question

[John Baird <jbaird@xxxxxxxxx>]

Lincoln@xxxxxxxxxxxxx  said;

>>>>> I just don't know what to make of the many different choices out
there.  I understand guide #'s for flash, but not wattage for strobes.
If anyone that knows the answers to this (John Baird?, Borris?), you
can e-mail me on or off list. I don't know if this would be of interest
to all others.<<<<<<<

hi lincoln!!

i have a speedotron D1204 powerpack with two strobe heads!  the model
number indicates that the powerpack is capable of outputting a total of
1200 watt seconds of power to from one to four strobe heads!  using one
head,  it would recieve the full 1200 w/s, two, would put out 600 w/s
each! by changing the symetry setting you could send 400 w/s to one and
800 w/s to the other! and four heads would flash at 300 w/s each! the
unit can be adjusted to send less power to the heads down to 50 w/s!!

i never stop to figure out the guide number because i use a flash meter
to find out how much light i'm actually getting at the subject! this
unit will put out f16 to f32 light for 100 asa film on a subject 8 feet
from the strobes! using umbrellas for softer light drops the f setting a
couple stops!

on the side of the power pack is stencilled this graph;

guide numbers for asa 100 film with 
the standard (65 degree) reflectors;

 power         guide #
1200 w/s   -    350
800  w/s   -    300
400  w/s   -    210
200  w/s   -    150
100  w/s   -    105
50   w/s   -     75

hope this answers your questions about pro studio lighting!!

tooDDDeloo!!   janni bearDDD!!   creative stereography!!   kansas city!!


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