DELTA are the slowest Brainwave. The Green LED is a signal of the Actual Wave. The machine is not malfunctioning on Delta, it is actually producing a “Sloth Like” wave which takes a much larger time to complete than any of the other wave types. The Green Light is reflecting the wave speed only. The Green Light will not flicker. The flicker only means the wave is faster like the Beta wave, see chart below from Scientific American. See this chart attached, borrowed from Scientific American. On this chart, the slowest frequency at the 2 bottom lines have slow rounded waves https://www.scientificamerican.com/article/what-is-the-function-of-t-1997-12-22/
(From the same article) The final brainwave state is delta. Here the brainwaves are of the greatest amplitude and slowest frequency. They typically center around a range of 1.5 to 4 cycles per second. They never go down to zero because that would mean that you were brain dead. But, deep dreamless sleep would take you down to the lowest frequency. Typically, 2 to 3 cycles a second.
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