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By contrast, transparent blocks such as glass and iron bars have no effect on the sky light level. Opaque blocks can prevent the spread of sky light. Sky light is not reduced at night rather, the spawning of mobs is determined by internal light values. Sky light cast onto blocks can spread to darker areas using a flood fill algorithm.

The sky light level for blocks exposed to broad daylight is 15. For example, dirt paths prevents the light from propagating downward, but the light can propagate in other directions. In Java Edition, when calculating lighting, the shapes of some blocks are detected: pistons, daylight detectors, enchanting tables, farmland, lecterns, stonecutters, dirt paths, snow, end portal frames, slabs and stairs, so that the light passing through them can spread only in specific directions. On a surface, this effect produces a diamond-shaped pattern of illumination around the light source. In Bedrock Edition, light-filtering blocks can reduce more than 1 level of block light.

If a torch with light level 14 is placed on a wall one block above the floor, then the block on the floor that is one block southeast of and below the torch has a light level of 11 (14 - 1 (south) - 1 (east) - 1 (down)).

If a torch with light level 14 is placed on the floor, the light level of the adjacent floor blocks in all four directions is 13, while the diagonal blocks in all four directions have a light level of 12 (14 minus 1 south, minus 1 east).

In other words, the light level decreases diagonally by the sum of the distances along each axis. This applies to each of the 3 coordinate axes. The block light level decreases by one for each meter (block) of taxicab distance from the light source.

There are 16 light levels, specified by an integer from 0 (the minimum) through 15 (the maximum).īlock light comes from light-emitting blocks, and spreads using a flood fill algorithm. Light may come from two sources: the sky and certain blocks. Light levels can be found on the debug screen in Java Edition.