According to an article in the December 8, 2016 issue of the journal Nature, an
LED light that flashes at 40 Hz, which is the frequency of Gamma wave in the
brain, may alleviate the symptoms of Alzheimer's disease. Also, a 40 Hz
flashing LED light is said to be an aid to meditation.
In the link below, I describe an easy way to build a 40 Hz flashing LED floor
lamp. About all you need to know is a little bit about electricity that you probably
learned as a kid, and a little bit about household wiring, such as how to replace
an electrical outlet in the wall of your home. Here's tke link: