Always light level 15
What I expected to happen was...:
Normal light levels, mobs that spawn during the night.
What actually happened was...:
Even with no blocklight and at night, the light level is always 15. No hostile mobs spawn.
Steps to Reproduce:
1. Put my PC on.
2. Openen Minecraft.
3. Loaded my world.
4. Done
The value of sky light is always 15, no matter the time of the day. The light level on block received by sky light depends on the time of day, this is not the value displayed on screen during the night. Only the block value matters. This is working as intended as per duplicated of MC-10410.