LIGHTING: For Filming At Night

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From this video, I have learned that to film at night, you must adjust the aperture, ISO and shutter speed in the right way. 

ISO
The higher the ISO number, the brighter the image
ISO 100 = Dark
ISO 1600 = Bright
Any higher than 1600, the image will start to get really grainy. 

Aperture
The lower the aperture number, the brighter the image
F/22 = Dark
F/2.8 = Bright

Focus
You should also film in manual focus instead of auto focus because then, the focus won't keep trying to search for something to focus on. 

Video Mode
Also, you shouldn't film in automatic video mode because then you lose control over the ISO, aperture and shutter speed which makes the shots not look the same and gives a lot of image noise because the ISO is adjusted too high or the shutter speed is adjusted wrong or the image might start to flicker and also the video may be exposed to dark. This is why you should film in manual video mode.