Provided you start with no light, and also that you do not overexpose, you can light up things (subjects, backgrounds, etc) by using gels.

Like here: a red gel for the background, and a yellow gel for the face/front of subject.

But here’s the funny thing. She was wearing a blue top. Blue! And here it shows as green!

That is because blue paint + yellow light = green. Try it. And similarly, try mixing other colours. Try to look up additive and subtractive mixing. Google “colour mixing red green blue” and see whether you can recreate the combinations. And since it’s science, of course you can. But also try to mix other, non primary, colours and see what happens. gels can be a lot of fun!