They do well, for what they are. They are not as bright as an equivalent sized HID, but are the best of the LEDs in that size range (I'm betting that a quad pack KC Flex setup would be similar) and are brighter than the equivalent sized VisionX Light Cannons.
Doing a comparision with pics is...
Take a look at my post above (#286) to the testing I did this year. They did very well and the flexibility in setting them up (beam patterns and bar size) can't be beat. The 30" spot bar put out as much light as a 50" Rigid.
That would be nice, but I can only test what folks show up with...
I got a new bumper and replaced my 20" and LZR cubes with two 30" KC Flex leds (one spot, one combo) and a pair of Flex duals (flood). I still have the Squadrons on the hood).
Here is a write-up on my install:
http://www.fordraptorforum.com/f81/kc-hilites-flex-led-install-41816/
As a follow-up, I was able to do another test this year. Here are the results:
http://www.fordraptorforum.com/f81/lighting-shootout-results-trr-2015-a-42166/
I was pondering some of the same points as Dan. My solution was to test different lights at different distances using a lux meter. Lux (light per area) is by far the best unit to measure true light output. For example, at 50 yards, a Rigid 40" light bar put out 36 lux vs the 4 lux an M&R (a...
I got mine in the mail yesterday and had a chance to read the article. Very cool to get a magazine feature. They definitely took the overland point of view in the article (not the cheap truck p.o.v.)/ Your truck has always been one of my favorite builds on ExPo.