HOW high up in the air? Are you personally more than 128 blocks higher than ground level? If not, then yeah, you may need to move the farm or your AFK spot for using it higher off the ground, or else light up any near-subsurface caverns.
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"I think I'm starting to like this `programming' thing. It's about four times as fun as shaving." -- Notch, June 12, 2011