Yes, thanks.
Woooops! Well, that made a mess........
Entirely my own fault, I placed the kext in my Extra folder, ran the EDP to rebuild mKext, and rebooted.
And spent the next hours re-installing OSX.
Could not even boot single user.
The problem was that after installing Lion, I ran multifail, wich went fine, but in combination with the kext's already residing in /Extra, running EDP wasn't such a great idea.
Learned a lot though.
The Kext did help though. Even with only a part of the booting proces completed, I didn't see the nasty dimming anymore.
So it was the cure, now I only need to give it in a proper way.
Not today, maybe tomorrow, or maybe I will just wait for EDP 2.0.
Thanks for your help, Leon.