Just a 45w fluorescent bulb.

Because it was indoors and without that the footage would have looked much worse due to a slower shutter speed (not as smooth motion), higher iso (grain), different (much warmer) color temperature.

The s7 has a decent 'pro' mode that lets you lock the ISO, Shutter Speed etc...

The s7 wouldn't necessarily be a good buy just for the camera alone; might be better off with a used DSLR camera in that case. But those can't fit in your pocket.

Best of luck to you.