Plasma torch

The Plasma Torch is used by Covenant forces to easily light dark areas quickly and efficiently in a battlefield setting. They have been in use since the first Halo game, but have had slight differences in appearance. They operate by emitting a blue plasma glow whenever they detect motion nearby, conserving energy by automatically shutting off once the motion leaves the immediate area.

There are minor differences between the versions, in the original Halo game they emitted an actual plasma flame, while in Halo 3 they extend slightly and then emit a soft blue light.