Light

Summary
Light is one of the nano-augmentations in Deus Ex and Deus Ex: Invisible War.

"Bioluminescent cells within the agent's retina provide coherent illumination of the agent's field of view."

- Deus Ex description

It is a non-upgradeable augment that is installed at the start of the game.

Characteristics
It is a nano-augmentation which enables the user to navigate dark areas. This ability cannot be upgraded with an augmentation upgrade canister. It drains Bioenergy at a rate of 10 units/minute.

The only disadvantage of Light is it can compromise an agent's stealth. It can be spotted by enemies, disclosing its source location.

JC Denton has this augmentation already installed in 2052 when he begins his first mission in Liberty Island. In 2072, Light does not expend energy, but only illuminates the area immediately around the user. Alex Denton has this augmentation by the time they arrive at the Tarsus Academy in Chicago.