Portable light source
Player can employ a lamp, flashlight, torch, or any other device, magic, or natural phenomena that produces light to better see in darkness.
Alternate names: Flashlight, Torch, Lamp, Portable light source, Floodlight, Headlight
The first video game about Portable light source was released in 1981.
* Vision modes
* Vision enhancer
* Glow sticks
* Circadian cycle
* Stealth - usually no stealth game has the player carrying a light source no matter how dark it gets.
This is applicable to strategy/management games where you can manage the lighting conditions of your domain (e.g. installing additional lighting).