I will make it a lot easier. This is not exact math, but it includes a small, built-in margin of error: 100 watts = 1 amp. Stay under that and you should be fine. In other words, three 650 watt lights will work on a 20 amp circuit. Two 1,000 watt lights will just barely work on a 20 amp circuit.

I did not even watch the video and can tell you that the best way to mic non-professional talent is to use a boom mic. I shoot tons of interviews with non-pro talent and can tell you that when I edit I use the boom mic 95% of the time. I think the interviewee is way more relaxed if they can simply walk in, sit down, and not have someone get in their personal space. Your results may vary...