So, if I understand correctly, this is a series of inhalations and exhalations with each time the sphere expanding on the inhale and retreating on the inhale, though increasing in intensity of brightness?

I very much like the condensing of the light to an infinite pinpoint and moving to solar plexus and then third eye and sending out to the entire universe.

My question is about the inhalations, is the macro infinity also being exercised?

Perhaps, a suggestion would be to allow the color of the light to reveal itself, if it has one and also the temperature and "texture" or vibratory feeling.

Depending upon whether one is standing or lying down this meditation would have different quality or effect....

Infinitesimally small and bright is an intense thing! Placing the suggestion to allow for this dimension is the best way to encourage such a marvelous state.