I replaced my mains with phillips blue visions and dipped with x-treme visions, think i read somewhere that the diamond ones weren't road legal? might be wrong there.
The blue visions do give a really nice white light and whilst the x-treme ones on dipped are very powerful, they don't give the 'crispness' that white light seems to give.
I will at some point likley replace the x-treme visions with blue visions and see how I like them.
On the topic of fitting the bulbs, I found this out when I did mine:
Removal:
1. Unclip the two springs/clips holding the plastic back cover on.
2. Remove plastic cover
3. Remove wire/electric block
4. Unclip the metal spring clip by pushing it toward the the front of the car and moving it sideways away from the hook on the bulb.
5. Pull out the bulb...done!
Attaching new bulb.
1. Position the bulb in the hole, NOTE: The bulb has a right and a wrong way up, there is a 'lug' as my dad called it! on one side of the bulb (the side of the bulb with the flat edge). That side should face upward, you will know it's right as the bulb will sit flush that way, and not any other way.
2. Re-clip the spring. This SHOULD be easy, assuming the two bottom legs of the springs are still in the holes below simply bring the spring up to rest on the bulb, and hook it over the bulb by pushing it slightly to the left and pulling it toward you.
NOTE: If you have taken the whole spring off, as I did the first time, put the spring legs back in the two holes below the bulb before trying to clip the spring over the bulb. If you don't you won't have any tension and the legs will be fiddly to get in!
It's also tempting to clip the electrical block onto the bulb before trying to put the spring back on....this is wrong! I did it, got frustrated with the spring and had to take the other side cover off to see how it was attached before I worked it out! doh!
3. Reattach the electrical block by pushing it on....simples!
4. Replace the plastic back cover and clip the two springs back in place to hold it on and you're done.
The second bulb literally took 30 seconds, once you know how the spring works it's childsplay!
EDIT: Not sure if I took any pics when doing it, will have a look on the camera when i get a chance.
Did this for the indicators if it's any
help!
http://dougmcdonald.co.uk/blog/2011/01/30/seat-leon-silvervision-indicator-fitting-guide/