Dosage info with LSD is really quite ambiguous being that unless you created the solution with the crystal yourself, you have no real way of knowing how much you're taking. Hell, a few trips back, I was told each hit was about 70-90ug, so I took two, assuming in the past I'd had much more than that, and I was walloped over the head by the intensity.
So I never even ask about ug dosage. I just try one tab when I get a batch and then go from there. I used to halve 1A-LSD blotters to about 70ug and that was enough to get a decent trip experience, and supposedly the two are about equipotent.