How much light(watts) do you need to shoot f8 to f11 in studio

[Dylan777]

Thanks everyone for your input and little lesson about distance, headshot, full shot and family portrait.

 

[mingyuansung]

So have you decided something yet? Or maybe use 2 speedlights with soft boxes someone suggested since you are using your garage?

 

[AudioGlenn]

I know this might be slightly off topic, but I do just fine with a 600 ex-rt, a 430 ex II. Sure my recycle times aren't what they could be with studio strobes but at 1/16 power on both of them (1-softbox, 1-umbrella), I'm between f/5.6-f/8 @ISO 320, 1/160th sec., AND they're portable. I'm sure I could bump up the power and lower the ISO to 100 for similar apertures.