LED Phototherapy Unit

It is widely thought that light can be therapeutic for the human skin and soul. Light at the correct wavelength may also be effective against depression and allergies.
There is a wide range of products on the market, at prices from a few tens of pounds to a hundred pounds or so, which are presented as universal remedies for dust allergies or hay fever. If we look at these devices in more detail, we find that their operation is relatively simple to explain.