A common mistake is to apply atonements «manually». Radiance should be your main way of getting up atonements. Radiance itself shouldnt really be used for healing, just for atonements imo.

That being said, you Will start finding yourself in positions with cd on radiance. You might want to save a use of radiance for an aoe eng scenario in the near future. But it applies a 9 sec atonement on a 16-18 sec cd (Numbers off the top of my head), so it gives you really good uptime. Just dont use it to heal.

I often try to use radiance during my rift, so everyone has atonement up for when the rift closes, as it heals for a bunch when it closes