Luminance

Lighting affects visibility, Mob spawning, tree growth, and whether flowers and mushrooms will stay planted. Lighting can be provided by sunlight, torches, fire, lava, in-use furnaces, and certain other objects.


Light-emitting blocks

File:LightEmittingBlocks.png
Blocks that emit light

The following values are the brightness of the block itself. The light emitted decreases by one for each square of distance from the light source. Glass does not diminish the light that passes through it, but water or ice reduces light that passes through it by 3 (2 for passing through +1 for normal block decrease). In Minecraft's source code, the luminescences are defined using the floating point values in the third column. In a weird quirk, these floating point numbers are fractions of 16, but are multiplied by 15 to get the integer light value. This means that both 0/16 and 1/16 (0.0 and 0.0625) correspond to the integer light value 0.

Icon Block Light Level Data Value
EnvCSS.png
(Sunlight) 15 1.0F
Fire.png Fire
Jack-O-Lantern.png Jack-O-Lantern
Lava.png Lava
Glowstone (Block).png Glowstone
Locked Chest.png Locked Chest
End Portal.png End Portal Block
Redstone Lamp (Active).png Redstone Lamp, when active
Torch.png Torch 14 0.9375F
Furnace (Active).png Lit Furnace 13 0.875F
EnvCSS.png
(Sunlight, when raining or snowing) 12 0.8125F
Portal.png Nether Portal Block 11 0.75F
EnvCSS.png
(Sunlight, when thundering) 10 0.6875F
Redstone (Ore).png Redstone Ore, when touched 9 0.625F
File:Redstone (Repeater, Active).png Redstone Repeater, when active
Redstone (Torch, Active).png Lit Redstone Torch 7 0.5F
EnvCSS.png
(Moonlight) 4 0.3125F
Brown Mushroom.png Brown Mushroom 1 0.125F
File:Brewing Stand.png Brewing Stand
Dragon Egg.png Dragon Egg

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