In article ,
Gregory Blank wrote:

A really nice feature, perhaps more important than ws is can you
independently adjust output to each of the heads. I have a 1200 ws
Power pack but can't independently adjust the lights, other than to
move them back or forward or use a louver inside the softbox.

1200 is good and strong for 100 asa. More is better if you can afford
it.

Jeez...you don't need to give 'em a sunburn. Shooting portraits of
ordinary people at f/16 is not advised.