Grow Light

The Grow Light is a placeable pre-Hard Mode item. If it illuminates any planter or pot, the plants in said pot will grow 50% faster than normal, while also having a chance of granting 1-2 more seeds upon being harvested.

It can be bought from the Dryad for 1 or crafted.

The Grow Light can be toggled on and off by right-clicking, as well as by wire.

Crafting

 * 1 Wire
 * 2 of any gem
 * 1 Meteorite Bar

Sprites
From left to right: Topaz, Amethyst, Sapphire, Emerald, Ruby and Diamond, all unpowered.