Main Features:

• Adds the Moonlight back into the game. Each biome has a unique Moonlight color. Old PEAK versions used to have this, not sure why they removed it.
• Darker nights. Different biomes have different darkness levels.

Sub-features:

• Item light emission for items such as Napberries and Faerie Lanterns.
• Adds back various missing features (Lava Bubbles, Caldera Cloud Ring, etc.).
• And some more stuff, but you can find out as you play.

Notes:

• Enabling extra lighting does eat some performance but only if you spam 6+ dynamic light sources in close proximity. From testing, using items such as Lantern, the real performance eater is the fake glow that was introduced in The Last Ascent.