What RogerB posted is true.
They give the "white light" appearance by filtering the blue light out. This drops their lumens output and actually makes them not as bright.
If you want the best output from your headlights I suggest the Phillips Premium 9005 bulbs in both slots.
The Silvania XV bulbs are another very good choice but they do not make them in a 9005 bulb so you are giving up some wattage.
Out of the "blued" light crowd I have tried Cool Blues, Silverstars, & APC's 4000k Plasma. The APC are the brightest and will likely last the longest (the have by far the largest bulb area)
