Hank, I am still using my red light laser, but only about once every 2 weeks. . I still only use it on one or once in awhile on 2. I have a local friend in my home town who purchased one for his knee and it has worked great for him. I am sorry it did not work for Linda. Maybe it would have if you would have backed off on the power once it felt too strong. My husband and local massage therapist in my town use just red light for aches and pains or after a strenuous weight workout and they both love it. We are all different in our bodies and not everything works the same rate or degree on each other. I 100% love my red light laser and I am so grateful for its results. I did not use it during a shingles breakout. I used it for the pain and permanent nerve damage that the Shingles left me with. I now have permanent neuropathy on the left side of my head, forehead and left eye due to my shingles nerve damage. I was on various drugs in the beginning, but with side effects I did not like so I suffered for 4 years with my neuropathy pain before discovering the red light laser treatment. I still have mine and will not give it up. Once again sorry it did not work for your Linda, but that doesn't mean it won't work for others with their pain. I much prefer this over taking a drug. I would never suggest something that I didn't get good results from. NEVER!