Generate pseudo Gaussian random numbers for pwm pins

Identical numbers are fine. I am interested in getting fluctuations of light levels around some mean value. I actually just found the Gaussian library link just before posting this question. I also wanted to know if the values I generated can be saved to the pc for analysis purposes? Or do I need an SD card for this purpose.

Regarding the requirement. I am interested in learning the specific patterns of changes in light that cause responses from neurons in the retina. My LED will be my light source. Hope this helps