Keep in mind that you don't need a fancy light to see swirls. I posted about this in another thread. For anyone who thinks that you need an expensive light to see swirls, check this out. Here are swirls seen with an incandescent light bulb:
Halogen lights...
Or direct sunlight...
I actually show and explain how to do that on one of my DVD's, which is where those captures came from. None of those options cost more than a few bucks. Those swirl finding lights are priced on crack. If I can make my camera show it, then YOUR EYES can see it. Don't fall for the hype.