LOL!I can't speak for Shay but he had a bunch of lights available for demonstration. I would say bring your current light, figure out what works and what doesn't and then go from there. Hind sight 20/20 I would have taken the class first and then bought the light. I personally would not go out and buy a $150 light only to figure out it is not what you really want. Ask me how I know! Actually I was very happy with my current light (and still actually, it is in my pocket right now) but I see other features that I think might work better. But my current light is servicable and will work just fine for now.
Only part of the class actually used our lights. We actually used dummy lights to practice a lot of the strikes.
My SureFire C2 has been with me now for*** I think almost 10 years. Something like that anyway, a long time. It is my go to light. And yes it has even seen use a .25 roll once or twice in the Bars in Germany, they have a LOT of Weapons Restrictions there...