You have to compare apples to apples. The "Big" KC lights are a totally different animal... The DE's do produce a great amount of light BUT, they are fog lights not driving lights. I chose them because I didn't like the ION yellow of the PIAA.
I like the very small size and they produce a very even glow with no hot spots and look OEM... I used the Hella wiring harness but stopped at using their switch. I wired them in a OEM push button switch that goes in my "Fuzzy Hole" replacement bezel.

I'm doing a write up for installation that will take me a day or so to get done so, be patient..