nother question

i have some hella spot lights and I need some new bulbs. They are the H2 variety and i can get 55w or 100w normal bulbs or the new fangled ultra white xenon gas jobbies that have the modern blue tint( according to the blurb) in 55w but are so say brighter!

Anyone had experience of any of these? which is best?
thanks again
Al

just this week in farmers weekly they have done a light bulb test of i think 7 different supliers and ring ultraxennon came out on top dont know if that do just spot bulbs though