Yes that is usefull. I think im using the type of regulators they mentioned (the bad ones). The plan was to use a 12V one for the LEDs and a 5V one for the rest of the circuit. It will help picking the correct resistors for the different colors too (each color uses different amounts of amps and volts)

The lights im making are actually like spotlights so i would have thought a 15 degree angle should be fine. There is a directivity diagram in the datasheet Im not sure if thats what you mean. I can try and compare it with some other LEDs i already have but the best thing is probably to buy a few and turn them on

I do have a multimeter and now a PC oscilloscope. I had to use them a lot while getting a test circuit working with the origional multicolor LEDs

I see what your saying about the transistors. I did have some running with the old LEDs though and they seemed to be fine. They did start getting a little hot so i turned my PSU down a little. They cooled back down and continued to run for about 2 hours with no noticable temperature increase. I will order some mosfets instead though just to be on the safe side.

I think what im going to do is try to figure out exactly what mosfets and resistors i need etc for those LEDs then buy a few and see how they work