Continual Flame

2nd-Level Evocation Spell (Artificer, Cleric, Druid, Wizard)

Casting Time: Action
Range: Touch
Components: V, S, M (ruby dust worth 50+ GP, which the spell consumes)
Duration: Until dispelled

A flame springs from an object that you touch. The effect casts

Bright Light is normal illumination. See also Exploration.

in a 20-foot radius and

An area with Dim Light is Lightly Obscured. See also Lightly Obscured and Exploration.

for an additional 20 feet. It looks like a regular flame, but it creates no heat and consumes no fuel. The flame can be covered or hidden but not smothered or quenched.

Source: Player's Handbook, p. 256