What is the exact range of the Extra Utilities Magnum Torch?

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All the various wikis give the range of the Magnum Torch from Extra Utilities as "a radius of 32 blocks".
What shape is that? Circular, Rhomboid, or Square?
In particular, if I make a grid of them, how far apart can they be?
I'm playing Agrarian Skies version v3.1.4 (MC v1.6.4) if versions matter.
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Magnum Torch Tutorial [Yogscast Complete pack tutorial]
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