While doing meditation thoughts developing on cittarupa and the what is appearing on the field too disappears together feel like anattma(non self).At that moment citta goes out into the field and light appears from the point it has gone.no attachment it is freed and moved towards. No sensations of body has appeared. (Eg sound ....,...,)what is this experience?
I believe the speed of letting go of things is one of the indicators from Indriya-bhavana Sutta
There is the case where, when seeing a form with the eye, there arises in a monk what is agreeable, what is disagreeable, what is agreeable & disagreeable. He discerns that 'This agreeable thing has arisen in me, this disagreeable thing... this agreeable & disagreeable thing has arisen in me. And that is compounded, gross, dependently co-arisen. But this is peaceful, this is exquisite, i.e., equanimity.' With that, the arisen agreeable thing... disagreeable thing... agreeable & disagreeable thing ceases, and equanimity takes its stance. Just as a man with good eyes, having closed them, might open them; or having opened them, might close them, that is how quickly, how rapidly, how easily, no matter what it refers to, the arisen agreeable thing... disagreeable thing... agreeable & disagreeable thing ceases, and equanimity takes its stance.
Sounds to me like the fourth one, the udayabbaya nana. Seeing light is very common at that stage. There are other phenomena that can occur. It differs with each person. Just keep noting, it will go away sooner or later.
You could check the list on the website of Vipassana Dhura.