I think most people have 35w HIDs.
They are by far more superior than the normal ones.
I only choose 8k as I like the blue tint it gives off. Even though it produces more power it emits less light due to the wave lengths. If your getting 6k they be brighter
My HIDs I think are slot brighter than the rest on the motorway. when I'm passing then my light travells a greater distance. I rarely even put on the high beams when it's pitch black.
Hope that answers your question