the best light output while sticking with stock type wattage is via toshiba HIR bulbs - check the bottom of this page-
http://www.rallylights.com/hella/9005.asp and 9006 are
http://www.rallylights.com/hella/9006.asp. HIR bulbs are not uber white, but they actually give off the most light, literally, unlike most bulbs that only color the light to make it seem like they are brighter. The only downside to the technology is there is a hair less life in them compared to the best traditional performance bulbs. Still not bad; i've been using them in my fogs since January, about 7000 miles and my lows and fogs are on every time i drive.
Hella makes a bulb that puts out a very white light and has a decent lumen count (actual light produced), but leaves a bit of a blue reflection in the housing -
http://www.hella.com/produktion/Hel...Products/Performance_Lighting/Bulbs/Bulbs.jsp
these bulbs are the reason the silverstar ultra was conceived, to be able to hang with the Hella offerings.
to those who claim short life from the silverstars, that is very unusual. they typically show rather long life. maybe not the life of a stock type bulb, but they certainly have the engineering to outlive most aftermarket bulbs, especially in DOT wattage levels.
on the lower end, two companies are around that offer pretty good quality bulbs for the price- Optilux and Nokya. They are both Korean made; the XP is the DOT wattage offerings from Optliux and gives a mostly white light with a slight hint of purple. Nokya offers their Arctic white in DOT wattage- these are slightly blue, mostly white.
