Exposure Value - Changing the EV compensates for the amount of light that is allowed in.
You can change this value to a lower setting if the scene is too bright,
or higher, if it is too dark, but still depends on your desired effect.
A higher EV will take longer for a photo to be taken, and will add blur to videos as each
frame takes longer to expose.
Note that if the scene is too dark, no amount of EV adjustment will add light into your scene.