I replaced my stock headlamps (H13) with a set of SYLVANIA Silverstar ZXE, they are a whiter light rated @ 4000 - 4200K. They operate @ the 55W level (same as stock) so they will not overheat the headlamp housing. I now have plenty of light when driving @ night
Not trying to argue with you, but that's simply not true. I had the same exact experience that you do. I
thought mine were brighter...because they were whiter. They are in fact not brighter. They are
dimmer. You get less light output. You get more
perceived output because the light is whiter.
The stock H13 puts out 1100 lumens low beam, 1700 lumens high beam from one source I read, but all the rest say 1000 lumens low beam, 1500 lumens high beam.
http://www.explorerforum.com/forums...rightness-in-lumens-of-h13-high-beams.154754/
The Silverstar ZXEs put out 1000 lumens low beam, 1500 lumens high beam.
http://www.candlepowerforums.com/vb...nia-Silverstars-or-Xtra-vision-for-car-lights
http://www.osram-americas.com/en-us...ems/Pages/lrgproductspecs.aspx?partnumber=H13
For their part, Sylvania is being coy by making it difficult to find the real lumen output numbers, but when they do, they cover themselves and list all bulbs as having the same lumen output. However, in their advertisements, they advertise it as being "brighter" and "whiter" and making it "easier to see down the road".
All marketing talk, and nothing more. In short, Silverstars are a waste of money. Full stop.