Blessing of Light

Blessing of Light places a Blessing on a friendly target which increases the effects of Holy Light (old) and Flash of Light spells on the target. A player may only have one Blessing per Paladin at any one time.

Greater Blessing of Light
Paladins also have Greater Blessings, which includes a Greater Blessing of Light which can be learned (purchased) from the Class Trainer. Each Greater Blessing affects all players of the targeted class within your party or raid and lasts for 30 minutes (as of patch 2.2).

Each Greater Blessing you cast requires the reagent Symbol of Kings which can be bought at any reagent vendor.

Tips and Tactics
A great use for this Blessing is to put it on your tank. Your healing spells will be more efficient. However, it should be noted that it does not improve the healing of other non-paladin healers.