How to mix colours
Add a coloured gel effect
First, we turn our light red, move it right, and set the distance so it’s to the side of his face (+0.38 in our case). Now, create a new white light and place it slightly left. We bring it in front of him to a distance of +1.31 (to stop it clashing with the purple light we’re about to throw in). We tone the brightness down a tad, to +0.91. Now we add a new light, make it purple, and place it high and left. We want it behind him (distance +0.20). We increase spread just a little: +15.22. One more light: push it right to the background, make it blue, and crank up the brightness (+5.59).