User: crazy dodo
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You would never gem SP instead of Int*. If you need more burst healing, haste is better than SP. This is because the base healing from HL is just a lot. That said, in a fight with significant to heavy tank damage you almost always want to prefer Int because of the longevity it provides. If you have to go great lengths in gemming and gearing haste / spellpower to keep your tank up, either you and/or the tank do not have sufficient equip for the fight, or you do not have enough healers assigned.
TL;DR: especially when gearing up for naxx, the HPS of HL is fine, just keep getting every bit of Int you can get your hands on. You will start to notice the difference when your raidbuffed manapool exceeds ~20k mana.
(*Caveats apply, this goes just for the majority of fights and for Naxx, though. This may or may not change in future with increased need to rely on FoL, but the main point stands).
Just the type of answer I was looking for. Thanks TimWischmeier