In 4.0.1, Blizzard added the ability for action bar buttons to "glow" when certain events occurred.
Infusion of Light will glow the abilities Word of Glory (all specs), Light of Dawn (holy) and Shield of the Righteous (protection) when the player gains 3 holy power. It also works when these abilities are macro'd.
I've been it myself for some time, and it's quite lean. It certainly works in a raid environment with no visible adverse effects.
It's been tested with the default WoW UI and with Bartender. I can't say if it'll work with other action bar mods.
(Note: this addon is named Infusion of Light because its original functionality was to glow Divine Light and Holy Light when the player gained the Infusion of Light buff. That feature was eventually built into the default UI.)
The purpose of this addon has changed, since its original functionality was built into the default UI.
It now glows Word of Glory, Light of Dawn and Shield of the Righteous when the paladin has 3 holy power.
Templar's Verdict was not affected as it glows from other procs anyway.
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