Proc does not heal you.
~15 second ICD.
Does not require friendly targets to be in group with you.
~10% proc rate (Takes me about 10 spells to proc it usually, but I have seen the smallest interval of 15 seconds in between procs.)
No target cap.
No Diminishing Returns on multiple hits.
Follows same exact range/positioning of Light of Dawn.
Seems to take into effect each hit of a spell in procing (I saw a noticeable difference in between spamming holy light and holy radiance)
Can crit.
Does not transfer to beacon.
Hope this helps.