From my understanding Holy Power was supposed to be generated by using spells that use mana.
Holy Light use approximately one third the mana of Flash of Light and Divine Light.
Please give Holy Light 33% chance to generate Holy Power when you heal the beaconed target.
In case another procs is a problem then we could have Holy Light to always generates Holy Power when it heals the beaconed target but that drains twice(or more?) as much mana as usual.