Minecraft wiki entry for Light, associated text: Lighting, the wool block is exposed to sunlight ("Moody" brightness setting).
Lighting, the wool block is exposed to sunlight ("Bright" brightness setting).
Lighting in the Void. Particles and entities are illuminated based on the light level at level 0.
Light being emitted from sea pickles, a sea lantern, and to a lesser extent, magma blocks.
Only the flowing water is lighted by a magma block.
A teaser from Notch showing the new lighting system for the Adventure Update.
Lighting during the day.
Lighting during the night.