Ok, so you have sowed the seeds of inspiration regarding the LED light clusters and I decided to follow your lead. Got all the tackle needed to grind off the bottom row of LEDs (Dremmel/vice/magnifier) and thought I'd just follow your basic instructions in the HID thread.
I know in principle what to do but seemed to have fallen at the first hurdle. After carefully grinding one LED off, so that only the metal hoop contacts are present, I tested the Bulb and as expected all but the modified row of LEDs worked. So I then soldered a 200 ohms 1/4W resisitor across the contacts replacing the removed LED and tested again. The other two still didnt work. I guess I've overlooked something blindingly obvious, but it's a long long time since I did electronics at school !!!
Could you point me in the right direction please. Cheers, Tony