AKA: Downranking with a vengeance
Flash of Light rank 1 costs 35 mana and heals between 67-77. It gets 19.00% effective coefficient from your +heal. I can cast it 10 times in 15 second. Meaning it’s costing me ~117 mana per 5 to cast it.
If I have greater than 117 mp5 then whatever it heals is free heals (except for the time spent healing).
Blessing of Light gives Holy Light and Flash of Light a flat bonus. This bonus is not effected by the coefficient. WowWiki says it’s 185 for Flash of Light (http://www.wowwiki.com/Blessing_of_Light)
The [Blessed Book of Nagrand] gives a flat +79 to every flash heal.
So then with the libram and BoL and +1000 heal each FoL1 should heal for about 521 to 531 points of damage. Effectively, 347 hps.