1) yes- they are called 'white' (caps are clear)2) interesting info on the combo-clips I will have to do some more investigation on those. My leds are 5mm with small flat-tops.thx
Here is a picture for you. The reds are just red LEDs (no combo clips)and I remember splicing them in with the white LEDs at some point. I'm pretty positive that I used white to green and blue as a 1:1 ratio and red and yellow to white as a 2:1 ratio as my rule of thumb. As you can see in the picture the brightness is uniform and I didn't have any problems with any of the light strings and no flickering at all.
Here is a picture.