In the new debug screen, the light level is always "15 sky" when you aren't under anything. If you do go under something, it lowers as if it was daytime, however, at night, it still acts as if it was daytime.
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Comments 6
WAI. MC-10410
Lol, I am indeed new to this community. Not to minecraft (I never paid attention to that section in the debug screen), however.
Expansion on Blah's comment:
Works As Intended. This value represents the maximum possible sun light at that block, see bl (block light) for actual light level.
You must be new here... Welcome! This bug has been in existence for basically the entirety of Minecraft.