What mantras are to be chanted during Kartik Poornima rituals?

The Damodara Ashtakam is the most specifically prescribed mantra for Karttika rituals. The Vishnu Sahasranama yields immense merit when recited on this day. The Ganga Stotra is chanted during the holy bath. During Deep Daan, the mantra ‘Om Namo Bhagavate Vasudevaya’ is offered with each lamp. For the night vigil, the Maha Mantra (Hare Krishna Hare Krishna Krishna Krishna Hare Hare / Hare Rama Hare Rama Rama Rama Hare Hare) is universally recommended for continuous chanting.