I've been using the d-light now for nearly 3 months. I used it everyday 45-75 secs per use across my whole body (type 2 skin) for about 2 months and the last month I've been using it ~90secs every other day, sometimes less.

First off, the 1st week with it was incredible, (I get severe seasonal affective disorder and clinically have low vit-d levels) I noticed extreme cognitive improvements. That effect tapered off after ~2 weeks, no idea what to make of that but to this day my SAD is markedly better which I'm so grateful for.