I have the smoked EVO-R fog and have it wired up the same way as ChriswX, with the exception that I put a switch on the wire for the flashing function and mounted it in the center console compartment, so that I can turn the flashing with brake function off. I only use it during track sessions or aggressive street driving lol. It bothered me that if you are sitting at a red light with your foot on the brake, it was just constantly flashing.
I can confirm that with the light simply 'ON' it is a certain brightness, and when the flashing happens it lights up even brighter. Just like the brake lights, where your LED tails light up brighter. I think I have a picture of it at night somewhere so you can see how bright it is. My tails are tinted 5% so the smoked fog matches pretty well, and the light output is about the same. The stock fog light was definitely much brighter however, that thing coulda been used in a light house lol! This one looks much better IMO, with it matching the look of the tailights at night.
There is also a really good description here as well as some videos of it in action. This is where I bought mine from
EVO-R FOGLIGHT