Both lights have four inventory slots that accept a single item only, similar to a Crock Pot. In these, players must place Light Bulbs, Glow Berries (or their lesser variant), Mushroom Spores, Festive Lights or Enlightened Crown Shards for the lights to function. The lights also act like an Ice Box and slow down the spoilage of the light sources put inside by 75%, extending the spoilage time by four times. Light Bulbs that spoil inside a mushroom light will drop rot on the ground nearby. If an Enlightened Crown Shard is placed in a mushroom light all perishable items in the light's inventory will not spoil. Festive Lights can be used for infinite source of light, as they will still glow even when they reach 0%.
The Mushlight is a basic light source that can accept all items listed above except for Mushroom Spores. The light emitted by a Mushlight will always be colored white, regardless of the color of Festive Lights and Enlightened Crown Shards placed inside. The more items placed inside, the bigger the light radius will be.
The Glowcap is a more advanced version of the Mushlight, having a more expensive recipe. Unlike a Mushlight, a Glowcap is able to accept Mushroom Spores. Mushroom Spores, Festive Lights and Enlightened Crown Shards placed inside will also make it glow in Red, Green or Blue depending on the item. Light Bulbs, Glow Berries and empty Enlightened Crown Shards will produce white light. Additionally, by mixing multiple colors in a Glowcap, one can obtain other color tones besides of the former three:
Purple- 1 Red Spores, 3 Blue Spore
Pink- 3 Light Bulbs, 1 Red Spore
Yellow- 2 Red Spores, 2 Green Spores
Orange- 3 Red Spores, 1 Green Spore
White- 1 of each spore type, leaving 1 slot empty.
Cyan- 2 Blue Spores, 2 Green Spores
The more items of certain color added into the Glowcap, the stronger the color will be visible. Adding white lights will brighten the color.
The Mushlight and the Glowcap were introduced in the Warts and All update.