Several modes available, I only uses one: the one that suits me best, after having tried them all. So yes, one can say that it is useless to have several modes to choose only; I would say that I really enjoyed being able to choose between several intensities and especially many colors lighting. After all, most lamps offer does q'une intensity and a color, both fixed. What if they do not agree ...? Everyone dislikes the cold white ... I use it for a week in my workstation for the computer work, with the most cool white (fashion "study") and maximum intensity, and I feel no visual fatigue, on the contrary, I seem to see the contents of my screens more easily. I hope that the life will live up to my expectations; if that's the case, I find the cost of reasonable lamp next to other products found on the right or left on the net.