When people we know die, like family, friends and so, we can recite Chenrezigs mantra Om Mani Padme Humand that is like a rainbow bridge that leads them in the right direction. To a human rebirth, where they can get everything they need to develop.
Every colour of light closes a door to a certain rebirth. White light (OM) closes the door to a rebirth as a deva. The green light (MA) closes the door to a rebirth as an asura. Yellow light (NI) is a human rebirth, which is what we wish for, but a suitable human rebirth with optimal conditions to practice. With access to education, health, dharma etc. The turqoise light (PAD) closes the door to the animal realm (sometimes a grayish light). The red light (ME) closes the door to the preta realm, the hungry ghosts. The blue/black light (HUM) closes the door to the hell realms, a rebirth as a narak hell-being.
Especially if people die a not so good death, an accident, suicide, this is really good practice. We send a lot of light and incense together with Om Mani Padme Hum.
LCR, June 2020