What is the maximum speed of the SK400IIV?
1/2000~1/800s
Is this high speed sync capable
Yes, this strobe is capable of HSS. X1, X2, and and Xpro trigger; they are all able to use HSS with the Godox SK400IIV.
Do you have 110 volts or can it be switched on 220 volts?
110V
Would this be a good source for a back light/rim light for back of head or is it too bright?
A: You can use it as a backlight or as a primary light source, but it works great with an umbrella with flash.
Can you use it with a Wescott umbrella?
Yes, it can. This Godox SK400IIV Kit comes with a light stand and a softbox, the softbox can have a good soft light effect, if you need a soft umbrella, it is also available in our store.