You always want the maximum power you can afford.
Not because you will always use it, but because it's there when you
need it. And those times will come. When they do come, those extra
dollars you spent will be well worth it.
As far as being able to see shadows with the modeling lights, power
will not make that much of a difference.
Master your light meter and do test strips of various exposures on
different film stock or digital settings and you will be set for life.
It cost about a half days work and less than $50.00 to get your equipment
fully calibrated for your work.
Don't let a few more dollars now force you to spend many more dollars in the future. Nip future issues in the bud today so you can have fun tomorrow.
Greg.
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