Well.... 128 radius is still a lot of space. Since mobs only become aware of you and aggressive when closer then 32 blocks, I think a radius of 96 blocks is more then enough!!!Well I was meaning, that Magnum torches only work for X amount of distance, and if A skeleton spawns it can hit you with an arrow, unless you are planning on standing on the torch the whole time
By the way, @SnowShock35 , magnum torchs had a range of 64 in 1.6.4. In 1.7 its 128... The quest book is incorrect.