The HID hi/low movement is so fast that when you flash back and forth really fast (without clicking all the way just enough to go hi and back to lo) it looks like a strobe light because it is instant. It is really fun to play around with. However turning on a whole other bulb while waiting for the other bulb to turn off actually takes quite a long time in comparison, we are talking instant with the HID and .5sec delay with the Halogen, really big difference![]()