Beautiful visions and sounds during the meditation - they are all mental conceptions. They come, and they would pass away. Be only the witness.

 (from "Conscious immortality"): 

Ramana

Question: There are beautiful colours in meditation. It is a pleasure to watch them. We can see God in them.

Bhagavan: They are all mental conceptions. The objects or feelings or thoughts, that is, all experiences, in meditation, are all only mental conceptions.

As regards those who have so-called nirvanic visions, it means there is a subject and objects. How can they exist in true nirvana [complete extinction, perfection, great peace]?

When Sundaresa Iyer, a local teacher, described yogic experiences, including visions of light, ringing of bells etc. which he was having. Maharshi replied, “They come, and they would pass away. Be only the witness. I myself had thousands of such experiences, but I had no one to go to and consult about them.”

Question: Can we not see God in concrete visions?

Bhagavan: Yes, God is seen in the mind. The concrete form may be seen. Still, it is in the devotee’s own mind. The form and appearance of the God-manifestation are determined by the mentality of the devotee. But the finality is not that, for it still has a sense of duality. It is like a dream vision.

After God is perceived, vichara, enquiry, commences. That ends in the realization of the Self. Vichara is the final method.