Right light intensity ratios for key, fill and back lights?

I've spent a bit Googling points on how to do the ratio of key to fill lights. I found this that suggests 2:1 as a standard ratio for interviews done in a kind of documentary style. http://www.cybercollege.com/tvp033.htm Does that seem right?(I'm on the communications team of a non-profit and currently doing a series of short stories of how people have been helped by this non-profit and I been using a 3 point lighting set with 3 the same bulbs but realized that wasn't giving as nice of look. I wanted to propose buying a double wattage bulb for the key and keep the other two as I'm shooting this in living rooms not pitch black studios so have decent ambient light to assist the backlight and background light.) via /r/videoproduction https://www.reddit.com/r/videoproduction/comments/54l83q/right_light_intensity_ratios_for_key_fill_and/?utm_source=ifttt