Also worth a look fella. Has bulbs + spots info
I always used to ride with my headlights on at all times, but now i have the spotlights i leave them off during the daytime now, 'cos the spots look better, are way brighter and whiter than the headlights, and really stand out to other road users.
Quite possibly one of the best but also cheapest mods i've ever done to the bike.
The difference in light output on the floor at night is just brilliant.