So it reads "Any heals you cast"
Does JoL qualify? It should, it's still YOUR healing spell, and in a 25 man, with 5-7 melee DPS plus tanks cranking out JoL and giving it to the Beacon, it might add up to be quite a bit, not to mention if you get in there and mix it up with a fast 1-hander + haste and SoL.
Do JoL and SoL generate the effect?
If so, how much do they accumulate, and if not, WTF not?! Get on it, Blizzard!