Holy Spherical Structures Batman!
B) Magnum torch has a 64 block radius, so says the wiki. And the biggest radius light I can think of is the wrath lamp.
Built from hand too. @.@ And I know its a 64 block radius. But I more meant.. whats the Y axis range? Is it a straight 64 blocks in every direction? Is it the center of 64 blocks so its actually 31 in every direction from it? Only on its level?