RH71 did you ever get an answer as to the wattage differences..i'm about to order and would like to know..

nope i did not... I wonder if it's really brighter... but I remember reading someone had an error thrown?

For those also interested in doing the fogs, I bought the 8500k H11 bulbs but to me they look a little more blue than the H8 coronas in 8500k. I bought a set of the H11 fogs in 7500k to compare hoping to get a little whiter light. I'll report back.

I did exactly this already... first had the 8500k and switched to 7500k... it still looks a bit blue when illuminated. The bulb is coated with blue so the fogs enclosure being just glass, it can't hide it too well. Still beats yellow in my opinion even if they aren't as effective.

Do the 7500k H11's look more white than the 8500k's?

very slightly... to anyone looking at the vehicle, it will still look blue-ish, still more than the coronas. If I had to do it over again I would've just kept the 8500k on and not bothered... but since you already ordered, go for it.

This is listed on ebay and claimed it is GP Thunder II latest version in 35W but output to 60W. Anyone tried this one?

GP-Thunder II 8500K H8 Light Bulbs For BMW E92 E70 X5 .: eBay Motors (item 400163779120 end time Nov-12-10 16:35:09 PST)

They are still 35W rated bulbs and that is what they consume, they are just marketing them as looking like 60W HID, but they are the same 35W as stock or the GP Thunder I version. I have them and they are in my X5 and E93 and look good, especially for the money!