I'm old school, my favorite light source for light painting is the full moon. Everything looks daylight until you notices the give tell-tales like smoothed out water to indicate long exposure, or night stars in the blue sky[0]. If timed correctly, you can get a moon strike which is where it starts while the moon is below horizon, and then the image starts to change as the moon rises[1]. I wish I had a link of live action video shot with nothing but moonlight.
If you have an actual budget, you can bring out enough lights to colorfully light up the side of a mountain[2]. (I have nothing to do with the making of this video)
[0] https://vimeo.com/241441999 [1] https://vimeo.com/241600503 [2]https://www.youtube.com/watch?v=ReMPjkJdvMY