In the 1.5 prerelease, if a world is created with a ceiling 100 blocks from the ground, and a hole is made and then sealed in that ceiling, the ground will believe it is in range of sunlight and will be light level 16. Moving around lights up more areas, and placing/breaking blocks does the same. This can be reproduced using a superflat world and the preset "2;7,10x1,100x0,7;1".
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Added pictures of the same preset with only a level 50 gap between floor and ceiling, which works.
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Duplicate of MC-911, please use the search function to see if your bug has already been submitted. Currently over 53% of tickets are being closed as duplicate.