Operative time; which is the time from insertion of the resectoscope till the time of catheterization, operative efficacy; which is the number or grams of the resected prostate tissue weight divided by operative time, enucleation efficacy (study endpoint); which is the number of grams of the resected prostate tissue divided by enucleation time, laser / prostate ratio; which is the amount of the joules of laser energy spent to remove one gram of the prostate tissue and the peri-procedure blood changes: Hg deficit, Hct deficit, Na changes.