Near Infrared (800-900nm) is just beyond the visible spectrum (400nm-700nm) – hence it is invisible to the naked eye. You will actually only be able to see a small pink dot or perhaps a very subtle pinkish hue emanating from the NIR LEDs when they are ‘on’. Please rest assured that there is a significant amount of light energy emanating from those LEDs and your Mito Red Light is in fact working exactly as designed.