When standing on Soul Sand in 14w33a while in the f3 menu, the light level will remain 0 no matter the actual light level. I believe this is casue by the fact that light level is based off what block your player's feet are in/on, and when standing on Soul Sand, you are lower than the texture, so it takes the light level from the area the block is in, which would always be 0 because there is always a block in the spot.
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This is not about the black item, this is about the Light Level being 0

Confirmed.

Duplicate of MC-46667