What's the biggest source of light?

In Minecraft, there are blocks that work as a light sources, and some blocks emit more light than others.

What's the biggest source of light in minecraft?

Solution 1:

From the minecraft wiki page on light:

There are 16 light levels, which are specified by an integer from 0 (the minimum) to 15 (the maximum). The game uses the light level of a block to compute the brightness of a given block.

Then from the light emitting blocks part of the page:

With level 15

1. Beacon
2. End portal block
3. Fire
4. Glowstone
5. Jack o lantern
6. Lava
7. Red stone lamp
8. Sea lantern

The other sources of light are below 15 so the blocks above are the best sources of light.

For comparison a torch is level 14, and a red-stone torch 7.