Flash of Light is a core paladin ability learned at level 14. It quickly heals a friendly target for a small amount. While most Holy spec paladins utilize Flash of Light to some extent, there is considerable debate between paladins that use Flash of Light as their core PvE healing spell, and those who prefer [Holy Light].
Use: Permanently teaches you this glyph. When you Flash of Light a target, it increases your next heal done to that target within 7 sec by 10%.
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Tips & Tricks
During the Burning Crusade expansion, "Flash of Light spam" was a popular style of healing for holy paladins in PvE. During the early phases of Wrath of the Lich King Flash spam fell out of fashion due to the nearly unlimited mana made possible by Divine Plea and Illumination. As the expansion progressed, there were several nerfs to Paladin mana regeneration. With the mana nerfs, the increased availability of high spell power gear, and increased availability of sockets allowing further spell power increases, Flash of Light spamming re-emerged in PvE healing. There is considerable disagreement over whether Flash of Light spamming is sufficient for the tank healing niche of Holy Paladins in raids, but it appears some paladins are using it successfully.
112% of your spell power is added to your Flash of Light spell.
The Tier 3 Paladin Set, Redemption Armor, includes a 6-piece set bonus of "Your Flash of Light and Holy Light spells have a chance to imbue your target with Holy Power."
The Holy-centric Tier 6 Paladin Armor Set Lightbringer Raiment includes a 4-set bonus that increases the healing from your Flash of Light ability by 5%.
Patch changes
Patch 4.2.0 (28-Jun-2011): Flash of Light mana cost has been increased to 31% of base mana, up from 27%.
Patch 4.0.6 (8-Feb-2011): Flash of Light mana cost has been increased by approximately 10%.
Patch 3.3.0 (08-Dec-2009): This spell no longer causes a heal-over-time effect unless the player has the Infusion of Light talent.
Patch 3.2.0 (04-Aug-2009):Sacred Shield: When a paladin casts Flash of Light on a target with this buff, they also now place a heal over time effect on the target, healing that target for 100% of the Flash of Light amount over 12 seconds. The Art of War: Now only applies to melee critical hits, but will make your next Flash of Light or Exorcism instant. Exorcism has a cast time of 1.5 seconds but can be used on players again. ...we are changing The Art of War to make not only Flash of Light instant, but also Exorcism. Choose healing or damage. (source)
Patch 3.0.3 (04-Nov-2008):Infusion of Light now affects Flash of Light too, reducing its cast time down to zero and can be used while moving.
Patch 2.4.2 (2008-05-13): Flash of Light and Holy Light will now work properly with castsequence macros.