Water is unhealthy because some people over indulge in it and drown.
The healthy part is being exposed to a smooth curve. One that living things have been exposed to for as long as history goes.
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Jeez. LED stands for Light Emitting Diode , that is all. You can control what frequency it emits based on the chemical composition involved in the diode. I’d suggest reading up about LEDs a little more
You should read what I linked