DSLR: Low Lighting

Shooting in an area which has low lighting is hard. I have looked for a video in which i could receive tips in recording in low lighting.

In order for us to film at night, we have to follow rules to reduce any grain or noise to the images.
Rule 1: Never go over ISO 1600 otherwise we may see grain or noise in the images.

Rule 2: Keep the shutter speed in between 1/30s to 1/50s this is because if we go over we may see some flickering in the images.

Rule 3: The Aperture must be between F/1.2 to F/5.6 this is because this determines the amount of light that hits the lens.

Rule 4: Make sure there is no contrast on the settings otherwise the images will be darker than it should be.

Important Rule: Only shoot when there is enough light available otherwise the image will be black. In addition the lower the aperture, the better quality the image will be.