In each comparison the Silverstars were 1/3 of a stop slower then the Nighthawks.
Which means that the Nighthawks are approx. 16.67% brighter then the Silverstars when it comes to light output.
When it comes to color the SIlverstars are definetly more blue. But how blue you may ask? Using photoshop and doing some calculations using the color curves and the histograms on my 20D I found that there was a 28.8% difference in the blue channel.11.9% difference in the green channel. And finally .52% difference or in other words negligible difference in the red channel.
Personally I am running Silverstars in the passenger side headlamp both Hi and Low, and Nighthawks in my driverside both Hi and Low. So far over the past 25 weeks neither one of my nighthawks have burned out on the Low beams. The Hi beam on the Silverstar has burned out once. It is too early in my test to judge the two of them based on lifespan.
When the Daytime Running Lights are on the car is running its Hi beams at a lower voltage in otherwords just running the Hi'* not at the brightest that they can go. I have noticed that the Hi beam on the Silverstar side is approx 50% dimmer. Thats a whole stop slower in photography terms...thats a big difference. I believe that there is some sort of connection between the DRL and the Silverstar burning out quicker.
Dispite what the report in ConsumersReport said about hi performance bulbs being a waste of money and will most likley decrease your vision is a lie. CR is a biased magazine full of flaws especially when it comes to cars...but I won't get into it here.
I recommend that if you do any nighttime backroad driving where there are deer I recommend upgrading your headlamps for saftey.
I was going to continue this test for a while but I just ordered a HID conversion kit for my low beams so I will have to continue the test on the Hi beams. But judging on reliablity and overall light output I may install another Nighthawk in the other Hi.
I do not reccommend PIAA bulbs or other aftermaket bulbs that run at a higher wattage. They run at a higher wattage and you risk ruining your headlamp wiring harness. In some cases they are pushing 85 or 95 watts in a 9006 bulb which is supposed to run at 55 watts. They are not worth the risk.
I hope that my little test and comparison can help people choose the right bulbs for their car. I will also post the new pics with my 10000k HID kit installed.