When I upgraded from halogens to litronincs I had a little trouble with the litronics at first, not coming on every time and so forth. A new headlight switch fixed it. I also got a new set of bulbs for the lights which helped out with the brightness - when I first got the litronics I was very underwhelmed. Once I got them sorted they were great.
Here is my thread:
http://986forum.com/forums/general-discussions/48494-got-some-used-litronics-having-problems-output-dim-they-dont-always-come.html
I got the Philips bulbs linked in the thread and they have been great and the new headlight switch fixed the flickering and other problems.
Steve