Maha Vairochana’s Mantra of Light — the Light of Compassion and Wisdom Illuminates the Universe
"The mantra is:
Oṃ amogha Vairochana mahāmudra maṇipadma jvāla pravarttaya hūṃ
English:
“Oṁ, amogha jewel-lotus of the splendorous great mudrā! Blaze! Set in motion!
An English translation from Professor Mark Unno, is roughly:
Praise be to the flawless, all-pervasive illumination of the great mudra [or seal of the Buddha ]. Turn over to me the jewel, lotus and radiant light.
Similar, but slightly different translation:
Infallible brilliance of the great mudra! Creating the radiance of the Jewel and the Lotus
Here you can read in some depth about the multiple levels of meaning and various benefits of this mantra. It appears to be associated with Padmasambhava.
Met this Rinpoche at Menla last yesr. He healed himself in a most auspicious way after having a gangrene leg and was scheduled to have his leg amputated.