This is a tungsten version of the Xenon light, but it does not have the dancing heat feature. These lights started in the silent film days when we had 2 ASA Kodak film stocks and it required this super focused light to even expose the negative. It has a flood and spot function that gives you a beautiful circle of light, but when you flood it out it gives you a donut shape pattern because of the globe being in the center of the parabolic mirror reflector. They create the most realistic looking SUN LIGHT source on the planet. I use them for shafts and different water effects.