I got fedup of constantly replacing expensive bulbs when they blew, so went for something cheap 'n' cheerful!
Headlights:
http://cgi.ebay.co.uk/ws/eBayISAPI.d...#ht_1936wt_939
Sidelights:
http://cgi.ebay.co.uk/ws/eBayISAPI.d...m=380202409111
I am really shocked how good they both are, the headlights give off a nice crisp white light that more than equals the Nightbreakers I had before.. And the sidelights give off a nice white/blue light, and reflect perfectly within the main beam reflector!
I've now used these, Osram Nightbreakers and Philips X-Treme Vison and the Ring bulbs are IMO the best (and cheapest!)... Don't know how long they'll last, but as bulbs only last a few months in my Zed I can't really give a fair comment!
EDIT: Don't have a side-by-side shot as my phone wasn't man enough for the job, but this gives you a rough idea of the light output: