As a laser tech in the o.r. I travel around different medical facilities with a variety of medical lasers including the greenlight as well as other BPH lasers. You have to understand that all lasers are absorbed by a something. In the greenlight's case it goes after red/brown colors (or blood in this case). With that being said, not all BPH patients are good candidates for green light. For example, some prostate drugs will take the vascularity (or blood flow) out of your prostate. Long periods of catheterization will make a prostate less vascular too. You'll get good vaporization on tissue you see right away. However, the less vascular gland will mostly heat up below the vaporized tissue creating a hot swollen gland. Technique is very important as well. The green light is most difficult to use at the bladder neck being that you dont want to hit bladder tissue. sounds like a bad place to be then. But you have prostate tissue that needs to be treated blending in at the bladder neck. A lot of times the patients problem lies in that area. I personally would want a thulium laser or holmium laser if I had BPH. Absorbed mostly by water and its safe around the bladder neck. Not nearly as many irratible symptoms because of the safer wavelength. Hope this helps.