Update:
After using Mtec H8 LED for couple of months I wonder if Mtec is better or LUX is better. So today, I reinstalled LUX to the driver side and put my car under the sun to do a comparison:
I took the pic with Nikon D90 without flashlight and without any picture modification.
You can see the outer ring is brighter on the drive side (LUX) comparing to the passenger side (Mtec). In person, I can tell the difference also even though Mtec is whiter comparing to LUX.
So guess what, I am switching back to LUX, period.