Flare of the Heavens

Source
This item drops from General Vezax on hard mode in the 25-man version of Ulduar.

Effective Spellpower
The effective spellpower granted by this trinket is calculated as a function of cast-time. Essentially, to get the most out of this trinket, you want shorter cast times. The formula for calculating the amount of effective +damage granted by this item is -

E = 850 * 10 / (45 + (t / 0.1)))

Where...

E = effective +damage t = cast time

The following Java Program can be used to obtain a table of effective +damage for different casting speeds:

public static void main(String[] args) {       float crit; float time; float effective; for(time = 1; time < 6.5f; time += 0.5f) {               effective = 850 * 10 / (45 + (time / 0.1f)); System.out.println(" " + time + " " + effective + "  "); }   }