Light

Light is a nano-augmentation which creates a coherent illumination of field of view, enabling the user to navigate dark areas. The source of light are bioluminescent cells within the retinas of eyes. This ability can not be upgraded with augmentation upgrade canisters. It drains bioelectric energy at 10 units/minute rate.

Light has a disadvantage - it affects an agent's stealth. It can be spotted by enemies, disclosing the augmented person's location.

JC Denton has this augmentation already installed in 2052 when starting his first mission in Liberty Island. He uses it in a lot of his missions.

As a biomod
In 2072, Light biomod does not expend energy, but only illuminates the area immediately around the user. A beam of light can instead be created by a Mako pistol.

Alex D has this biomod by the time he/she arrives at the Chicago Tarsus Academy.

Behind the scenes

 * In Deus Ex, an alternative to Light which does not consume energy could be the Dragon's Tooth Sword. However, the weapon creates little light.
 * The explanation why Light consumes no energy in Deus Ex: Invisible War is not provided in the game.

Appearances
Light nano-augmentation appears only in Deus Ex as a pre-installed played ability. Such is also Light biomod which appears only in Deus Ex: Invisible War.