Went to the Ultra Dot web sight. Says the l/t is 4moa dot. I think earlier ones may have been smaller.
I think they may have changed them, but may be wrong. The dot is tiny. I am trying to find the box it came in. But again, I don't think it is that critical unless you are planning really long shots on small targets, but if we are talking low-light, I am going to assume we are getting close to the animal.