After doing a little research on the subject, this is what I found out. Silverstars or any other so called "HID like" bulb, gives the appearance of a whiter, bluer light because the bulb is coated. Coating the bulb actually decreases the lumen output and you will in effect get less illumination at night. The only ways to get more light is to use a higher wattage bulb (this is not advisable) or upgrade to HID's or xenons.
For me, xenons were a must, which are standard on the E92. For you, if you really want better illumination, the upgrade, which is not cheap, is your alternative. If you just want a whiter, bluer light, Silverstars or any other aftermarket bulb will give you the effect you desire.
HIS: 2007 E92 328i 6MT (RETIRED)
HERS: 2009 E90 328i xDrive 6AT
ON ORDER: AT DEALER 2014 E84 xDrive 28i 8AT-Alpine White/Black Nevada/Silver Matte w/ZMV,ZLP,494