Fills the Paladin with divine light for 30 min, giving each melee attack a chance to heal the Paladin for (0.15*AP+0.15*SP). Only one Seal can be active on the Paladin at any one time.
Unleashing this Seal's energy will deal (1+0.25*SPH+0.16*AP) Holy damage to an enemy.
It was said that every enemy Uther felled strengthened his resolve.[1]
The Seal of Light fills the Paladin with the spirit of light for 30 min, causing his melee swings to have a chance of healing him. Only one Seal can be active on the Paladin at any one time.
The proc rate for the healing done by Seal of Light seems to be based on an average number of procs per minute, rather than a fixed proc rate per strike. Therefore, while under Seal of Light, each attack the paladin makes with a slow weapon has a greater chance for the healing effect to proc than if the paladin were attacking with a fast weapon. The average amount of healing per minute from the Seal of Light buff is therefore independent of weapon speed.
Patch changes
Patch 4.0.1 (2010-10-12): Seal of Light and Seal of Wisdom has been replaced by [Seal of Insight] which merges their effects. To be exact, Seal of Light was transformed into Seal of Insight which also gained Seal of Wisdom's effect, while Seal of Wisdom was removed.
Patch 1.4.0 (2005-04-19): Seal of Wisdom and Seal of Light should now replace each other properly as well as stack properly when used by different paladins
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Patch 4.0.1 (2010-10-12): Seal of Light and Seal of Wisdom has been replaced by 
[Seal of Insight] which merges their effects. To be exact, Seal of Light was transformed into Seal of Insight which also gained Seal of Wisdom's effect, while Seal of Wisdom was removed. 
