some people like to run 100w bulbs cuz they are a little brighter, and are cheaper than HIDs. however, they draw much more current than the stock bulbs, and creat lots of heat. When you run that kind of current through these resistors that run hot to begin with, they get really hot! he is not using HIDs, HIDs are not rated like that with watts(which is not the brightness, but rather the rate of power consumption), they are rated with lumens (light output), they actually run at lower wattage ratings and they draw LESS current than halogen bulbs... You cannot use this "trick" with HIDs, they don't use a filiment, they have an arc of electricity across two electrodes. If HIDs don't have the required amount of voltage/current, they don't dim, they shut off.