The debug screen displays sl=15 at night. I think that's incorrect.
Light Levels in debug screen perpetually equal 15
Light levels on blocks don't change at night
Light Indicator in F3 does not accurately list sunlight value
Light from sky doesn't change at night
Light level is 15 even at night
When night,the light level is 15 at sky
Night lighting is broken
The light marker is wrong
Lighting level from lightning is disregarded
Light Level High at Night
Light level bug
1.8 Lighting Glitch
Light for Debug Screen Broken
Sky ligth stuck at level 15 while at nigth
Light level during night stuck at 15
Light Level always 15, even at night
Sky light level doesn't change
Light Level issue when pressing F3
Always skylight level 15 during the night, no mobs will spawn, even on hard mode.
Skylight is always at light level 15 regardless of light and this doesn't allow hostile mobs to spawn
World being always bright no matter if it's lit up or night
Night under sky light displays in f3 as (12 sky, 0 block) but predicate tests as 4.
1.15.2 Realms Client Light Level
Sunlight Value staying 15 during night.