Two things.

To the above poster, I was under the impression that mp5 > spell crit for a heavy FoL setup (while the need for +healing is certainly not in question). There is significant discussion regarding this in the Paladin Healing Efficiency thread.

Edit: Your math seems good, though

And to those worried that haste will only lead to a faster mana dump on bosses, this is only partially correct. Keep in mind, with faster HL casts, Illumination will proc more. Since a haste/HL build tends to stack haste and spell crit, your primary method of mana regeneration actually scales very nicely with the haste. Yes, you will still lose mana faster, but with higher haste (and by extrapolation, higher HPS) you are able to downrank more, or simply cancel more and get those clutch heals off in time.

Just some input, feel free to tear this post a new one

You missed Sanctified Light in that t5+haste setup.

I left out Sanctified Light and Holy Power since they have no effect on the comparions in gear between haste/heal/t5. Only took the int, holy guidance, and kings because they work together to increase healing and crit.

Ah right, explains why the crit rates are so low aswell, apologies.

Right now I have the shoulders/bracers, and it's a very noticeable difference without sacrificing too much of my spell crit & mp5.
If I'm lucky enough to get 2 rings, i'd probably stop stacking it at that point.

I should warn you that 4/5 T5 + spell haste + the lurker libram... it seems to have some psychological effect on me where i'll often find myself using a downranked HL when I could have accomplished the same effect with FoL + the opera libram. And since in my guild the shadow priests are usually given to the mages, i sometimes get into mana trouble.

Spell haste also allows you to rez people faster, as well as a quicker summon for your charger.

SHHHHH... before blizzard nerfs it!

Well just from personal experience i can say that i run pretty good with the 4 T5 bonus and 68 spellhast rating atm.
Especially my overheal seemed to drop significantly compared to my guildmates due to my ability to get the first heal on a target while random healing. Since we run with 2-3 shadowpriests every raid i don't have mana problems in long or healing intensive fights either and top the meter on najentus without swallowing even one super mana potion. (unflasked).

2 charts to prove this:

Wow Web Stats
Wow Web Stats


At the end of course it depends on your personal playstyle (i like to play it around 60% flash. 40% holy light without downranking)

What's the point of 4pt5 if you use FoL so much? 83% of those Naj'entus heals were FoL. The rest of the fights were ~60/40. I'd think with that play style you're better off with 4/5 t6 and stacking +healing.

Good point, reason for that is that i actually tried out downranking HoL and not using FoL.
But i don't posses the lurker trinket and felt that my efficiency dropped.
with that correlation of HoL/FoL i run very well and didn't find a better setup yet casue you can be convinced that the important heals are fully using the 4p t5 bonus

The other reason is that my guild isn't so far in BT/hyjal that i could get 4p t6 yet.

As long as you are keeping Light's Grace up, I'm not sure how much using a lot of FoLs really matters. The main benefit of the haste set up is being able to drop quick, large heals in a pinch, while maintaining high hps for most of the fight. Although most people with a haste setup will generally move to HL4 or 5 as their main heal in a haste setup, again the most important thing is keeping LG up.

Even isntant spells require that extra safety measure due to ping variance due to the global cooldown, so in fact haste will not help in any way to speed up your number of FoL casts over given time if you're using /stopcasting.

Example:
ping=200
0.0 cast FoL, GCD starts on client
0.2 server casts FoL, starts GCD
ping changed to 180
1.5 GCD finishes, you instantly with godly reflexes hit FoL again, GCD starts on client
1.68 server receives FoL cast and returns "spell not ready"
1.7 GCD finishes on the server
1.86 you receive "spell not ready" which resets your GCD on the client and lets you cast again

As you can see due to ping variance trying to cast every 1.5s actually resulted in casting once every 1.86 seconds with these ping values. The only way to avoid this is to manually delay your casts by additional Xms, in this example 20, but in reality should be your maximum ping - your minimum ping if you never want to have casts delayed by this - less if you want to speed up most casts and have very few interrupted. Overall finding out how your ping really varies is near-impossible so just experimenting will probably give you the best information about what delay you need with your connection. From what I've been hearing from people this gets anywhere between 0.07s to 0.2s. For me it seems around 0.13-0.15s or so but I do run with a ping of around 400.

In some respects I'm an old school style of healer. Never had Light's Grace. So I tend to cast/cancel HL and use FoL as a topper upper. Our WWS shows me doing anywhere from 20-40% Holy Light. Personally, I view haste as a tremendous increase in my ability to deliver a heal. I am currently using the 4 pc Tier 5 bonus to great effect (#1 or #2 in healing in almost every fight. We are still working on Kael so this may change as we move forward.).

I've actually argued against the 90%+ FoL spammers from even being admitted into guild bceause I dont feel they are truly understanding healing requirements, and instead just using a brute force tactic to minimize exposure. Yet even in the FoL spam circumstances, I still feel landing the heal quicker will yield benefits.

So for me, the haste items seem quite exciting.