Post by Wedmark
I'm a Paladin which is healing in 25 man raids.
If you listen to people that say you should spam Holy Light you're making a fool out of yourself since you will go out of mana in a few seconds. The beauty of a Paladin is Flash of Light. My Flash of Lights heal for avarage 1300 and I have around 12000 mana raidbuffed. That's ~87k healing for one full mana bar excluding mp5, Illumination regens and such.
Flash of Light healing with ~10k mana and Divine Illumination up when it's not on CD and decent mp5, you can go on forever.Edit
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Post by Allotriophagy
1) Make sure Blessing of Light is on the tank.
2) Try and get the Opera libram from KZ = http://www.wowhead.com/?item=28592
3) Alternate between FoL7 and HL4 every 10 seconds or so, to keep Light's Grace up for when you need to cast HL11.
4) Get add-ons to help you heal more efficiently. Clique and PerfectRaid are my recommendations.
5) Try and get a shadow priest in your group so that you can be less careful with your mana pool.
6) Heal meter isn't everything.
What I do is cast HL rank 1 before combat begins and everyone is in position. I have the MT set as my Focus so I can see his health/rage/buffs. I heal by clicking on names in my PerfectRaid frames, which are set to show me who has aggro, who has magic/poison/disease effects, health deficit.
The pull begins, I start casting FoL7 if I am not expecting big damage and keep that up until it is time to do HL4 to keep LG buff up. If the tank is taking a fair bit of damage, I will alternate in HL11 too.
If the fight starts with big damage on tank, I pop Divine Illuminate and spam HL11 until it's under control. Otherwise, I save this for later in the fight, for example at Morogrim when other MT healers are tombed and I need to step up a bit.
If I am casting HL11 and the tank is healed by someone else and I would overheal too much, I cancel the heal and swap to a smaller one. This saves a lot of mana in a fight.
Generally though, I watch the fight, anticipate the damage by studying tactics beforehand, make sure I am ready for emergencies and just keep a steady stream of heals going.