I started using the Sota Lightworks device in this manner a couple of weeks ago. The paddle offers both the visible and non-visible light spectrum. I use both every other day. I'm excited to see what happens after a couple of months from this application. I am already sensing an increase in libido which is exciting. I'm amazed how little research there is to read on this subject. A web search returns almost nothing it terms of testicular application. You didn't mention what effects you have been experiencing. Anything you wish to share?