Obviously, the wider light color spectrum the light emits, the better the light performs. It's like you compare the good'ol flashlights to the cheap leds, looking directly at the light source the led seems brighter, but when you're looking at the area the light luminates it's just like it doesn't work, sort of, whereas the traditional light gives a balanced and good impression just limited by the amount of light you have available. The "ice cold" leds may seem very powerful, but doesn't necessarily work very well. I have a car with a combination of xenon and traditional halogen lights, and to be honest I feel that the halogen lighs are much better. This is due to the wider light spectrum they output and is also in part the reason for why the halogen bulbs use more power I believe.