There are 16 total light levels in integers, which are 0 to 15. Minecraft uses the light levels of blocks to calculate the brightness of a selected block. If the light level is 0, a block will be close to black. If the light level is 15, a white block will be close to white, and a green block will be close to green.
Blocks that emit light
|Quicksoil Glass Pane||11|