Thanks for the additional link!I stand corrected and find the same figure listed here.
As an example a 57w AquaUV would provide ~280,000 uw/cm2 and ~3x turnover on a 100 gallon (actual) system. As mentioned, this is what I initially installed but had issues with stray voltage causing my heater controller to misbehave. But YMMV.
Too many folks are sold undersized UV's and then don't understand how they get hit with ich.