More haste = More casts = More Daybreak procs = More HS = More IoL
Quite right, I forgot about this.
Lets do the math. I'll use this parse for my stats (including several boss kills): http://www.worldoflogs.com/reports/c9ii1or7nt4b76ya/details/33/?enc=bosses#tab-healspell
Now to figure out IoL procs value for Crit HPS we'll need to take Crits 1 to 1 value of ~0.56% per 100 Crit Rating and multiply by the Haste value provided. In this case its a flat 250% (1.5 sec every time, applied before Haste rating). This equates to ~1.4% Haste per 100 Crit Rating. That 1.4% Haste is applied only to DL and HL casts for the duration of the fight, and also only occurs once every 6 seconds (barring Daybreak procs). Divide by 6 and reduce based on the parse data for HL and DL (24.7%) and we get:
100 Crit Rating = ~0.0576% HPS from IoL
100 Crit Rating = 0.28% + 0.0576% = ~0.3376% HPS
Significant, but not nearly as much as I thought it might be. Next lets work in Daybreak (much harder I think).
Haste's effect on Daybreak is going to be based on the number of casts of HL, DL, and FoL vs the number of GCD's spent on other spells for a fight duration. Without a mod specifically tracking that its rather difficult to nail down - this parse only indicates the number of spells HITTING targets not the number of times they are cast. Using the numbers I do have, the fight durations, I've come up with a rough ESTIMATE
~30% of my casts were HL, DL, and FoL
100 Haste Rating = ~0.78% x 30% = ~0.234%
~0.234% x 20% (Daybreak chance) = ~0.0468%
100 Haste Rating = ~0.0468% Daybreak procs
Note: When you think about it it becomes clear that Daybreak is not an HPS increase except through IoL, which after all the reductions is going to be pretty insignificant. In fact, using the extra HS from Daybreak is probably a decrease in HPS but an increase in HPM. I'm going to keep this here for use at a later date, a fairly significant HPM boost for Haste I think! For better HPS, keep casting DL. For better HPM, abuse your Holy Power, Holy Shock, Holy Radiance, and Beacon as much as possible.
The next step is to apply Daybreak and IoL together... which I don't have time for right now. Feel free to use my numbers or tell me how terrible they are. :D
Because people apparently don't like long posts in a theorycraft thread:
- TLDR!! -
IoL is a pretty solid boost in HPS for Crit
Daybreak is a boost in HPM for Haste, and with IoL a small boost to HPS (much smaller than what Crit gets)
In both cases using HS is a HPS loss over straight casting DL (I'm pretty sure)