The amount of light this block will emit in a range of 0-15. Higher value means more light will be emitted. Reference values: torch (14), glowstone (15), redstone torch (7), soul torch (10). Monsters cannot spawn on blocks with light level 8 or higher.
Note
In format version 1.26.20, validation strictly enforces that the value must be an integer between 0 and 15 inclusive; out-of-range values are rejected at load time.
Alternate Simple Representations
This item can also be represented as a Integer number.
Samples
Block Fabricator
"minecraft:light_emission": 7
Block Gray Ore
"minecraft:light_emission": 15