I need to shoot in a reception room with no windows and low-light conditions. My Canon XF300 has a very good Gain feature that allows me to shoot pretty good video in dark conditions but I'm afraid of the image quality being affected by the noise it creates. So my question is: Am I better off using a light mounted on my video camera or should I use the Gain feature? The down side of the camera-mounted light is that it flattens the subjects and takes away the perspective. Thanks for you input!