Candle

A candle is a light source, which exists in an uncolored variant and 16 dyed ones. Candles can be lit with flint and steel and extinguished by water or with the use of a bowl. They can also be waterlogged, but cannot be lit while waterlogged.

Obtaining
Candles can be mined using any tool, or without a tool.

Light
Candles can be used as a light source, emitting light like a sea pickle. A single candle emits a light level of 3. Up to four similarly-colored candles may be placed in one block, with each candle increasing the emitted light level by 3, for a maximum light level of 12. They also emit fire particles.

Candles are not lit when they are placed, and must be lit using flint and steel, fire charge, or any flaming projectile. Candles may be waterlogged, but waterlogged candles cannot be lit. Lit candles can be extinguished using water or by the player with the candle.

Cakes
A single candle of any color may be onto an uneaten cake, turning it into a candle cake, which acts as a normal single candle. Only one candle may be placed on a cake. If the candle cake is eaten, the candle falls off. If the candle cake is destroyed, the respective candle is dropped.

Trivia

 * Candles are similar to the concept of burnt-out torches from the Halloween Update.
 * Using the command  allows for a both lit and waterlogged candle.
 * The same thing can be done using the debug stick.

Bugs

 * In the 20w46a snapshot for 1.17 you were able to get an unlimited amount of the newly added candles, this was done by placing a candle on a cake spamming right click on it and uh yeah it would just duplicate it for some reason as of later snapshots however this bug has been fixed but it's a cool little fact

Bougie Candela Candle Świeczka Vela Свеча 蜡烛