HID lights are a totally different lighting system than your stock or the H-4 conversion. The H-4 kits use light bulbs that can be bought just about any where, and can be had in everything from halogen to xenon to "silvavania Sliverstars". HID is REALLY expensive still around the better part of $700 while the H-4 conversion can be done for as little as $50. The H-4 conversion kits plug into your stock light harness, and is a real easy up-grade. I am using the housings from APC that I bought for $40, a set of H-4 bulbs for $10, and have no complaints with the light output, or the visibilty increase. My low beams are much brighter than the high beams were, and the high beams are REALLY bright. Also, the lenses on the APC housings are GLASS, not plastic, like some "other" kits. Overall, I am very pleased with just the H-4 conversion, and I plan to install an upgraded loom for my head lights this weekend to see how big an improvement that will make. The light [attern is more of a "pool" in front of the MJ, with a good range on low, and on high beam, there is a "pool" still, but you have a longer range of visibilty.