Sooo, a couple of days worth of testing, and these things are looking better and better.
I didn't compare them with the stock H4 halogen, but a friend is coming over this weekend so we'll be taking side by side comparison shots.
My initial impression is that the low beam throw is shorter for the LED bulbs, but the first few 10s of feet in front of the car is light up much better and clearer than before.
The LED doesn't have the beam pattern of the halogen, and I think that is why I measured so much more lux at the halogen sweetspot, than I did with the LED.
I have a really bad patch of road on my daily commute route where there's no streetlights. When the tarmac is wet and I have to use the low beam, normal halogen bulbs is hardly lighting up anything at all... I've felt like driving in the dark many times. The stronger the oncoming cars headlights have been, the less road I've seen ahead of me.
With the LEDs, I can actually see the closest 30-40 feet well, even with a slightly dirty windshield.
I took some shots to compare the low, high and high+xenons. Temperature is around freezing point, but there is just a little ice on the road. Road is not wet-black here even though that would be a better test.
Top is the low beam alone. Next is High beam, and the bottom pic is high beam with my NBB Alpha 225 75W Xenon on. Not sure if they had warmed up completely though
I had a friend drive the opposite direction, and he said the passenger side light was slightly blinding. I think it's a matter of adjusting the headlamp a little. So far, no angry drivers have flashed their lights or anything at me.