Why does a yellower (is that a word?) bulb put out more light than a whiter bulb? Does it take more energy to put out white light, so therefore for a given amount of input energy, the yellow bulb will be brighter?There is a huge misconception here with the 6000k, 8000k (blue), and higher HID bulbs.
As the Kelvin rating of a bulb increases, its Lumen rating decreases. Simply put: 4300K bulbs will put more usable light on the road compared to 6000K, 8000K, 15,000K bulbs.