Short tutorial/demo by Lauren Bateman showing how camera video quality changes under three lighting conditions: all lights off (noticeably degraded quality), one light (substantially improved), and two lights (brightest/preferred). She notes one light is often sufficient but she personally uses two with additional uplighting in the background for a brighter look.
What I'm going to do right now is I'm going to turn off the lighting for my video so that you can see how it affects the quality of my camera. Here you go. I've turned off all of my lighting and yes, I could adjust some of the settings and functions on my camera, but you can see how the quality has greatly decreased. So you can just see by just turning on one of my lights, I have greatly improved the quality of my video. Just having one light does plenty. Now, I particularly like my videos pretty bright, so I use two lights. I throw in a little up lighting in the background.
