Low settings on laser hair removal Light Sheer duet?

I am recieving laser hair removal on my bikini area and under arms. I am pretty light skined maybe even pale, with black hair. I have got two sessions prior to with the same machine. This time, at a new place, I felt it was not as hot and the vaccum wouldn't catch my skin. I told her but she said Ok. I looked at the settings, they all are low. Why? Should I tell them that Im not satisfied? That I dont think it was very affective? There aware I tolerate this well. I just want this to work.