I tried lightsourcing for the Prism Cannon on my Fire Prism. I'm not entirely sure about the result. If I find that I don't like it, it should be easy to both remove or improve on it.
To get the effect on the prism itself, I simply started with a white undercoat, which I washed black halfway up the front. Then I stippled on the reds from Red Gore, into Blood Red, and finally Golden Yellow. A lot of mixing inbetween these colors, of course.
What do you guys think? Any tips on the lightsourcing technique would be awesome!