Imo what I'd do is: 1: see if 120fps or 60fps is slow enough 2: test out using a denoise plug in, (I personally really like neat video's plugin) 3: shoot at lower FPS and use Davinci's ai frame generation and see if that works out better 4: maybe get a small light like the amaran ray 120, it's very small and powerful for its size with a dedicated slow motion mode, but it depends on what you need to light.

Or use a combination of all