The Focal Cap will fit on the end of any Standard AAH Light and will focus the light thru a small opening. This is ideal when you are wanting to reach into a cavity such as the nostril or ear canal.
Researchers have found that blue light in the lower wavelengths has been effective in destroying bacteria and viruses. Here are two published articles for your reading:
The Focal Cap is not only for the AAH Blue light though, we use it on the AAH Red light as well and that not only allows us to reach into these cavities, but also narrows down the light when applying to acupoints.