The light mode of each camera lets you select which lights to use.
Click the camera image, it will pop-out a quick menu on bottom, pls click Color & Light-Light Model.
Infrared mode: uses IR LEDs only. At night you see B&W night vision. And the camera will then automatically adjust the day & night vision.
full color mode: flood lights stay on at night, you see color night vision.(Only cameras with floodlight can do it)
smart mode: B&W IR night vision when nobody detected, flood lights automatically turn on when people detected.