Not sure what the intention of the change was but it looks like searing light has been changed and its now called Silver Fire. They changed the look of the spell and increased its Max Caster Level from 5 (10 against undead) to 20(no bonuses against undead) but the spell damage is the same as it always was. Something is wrong either the spell description or spell damage or both.
Also, the Favored Soul: Followed of the Silver Flame capstone claims to and still does cast searing light(original version)