I can't stress enough that combining different colors into a single beam for Lumia is rarely the way to go. Of the two units I have at the moment one has a pretty nice far field beam and the other could use some focusing. Both are about 3x6mm in the near field which is too big for Lumia developed for ion lasers, but that's easy to fix.
"There are painters who transform the sun into a yellow spot, but there are others who, with the help of their art and their intelligence, transform a yellow spot into the sun." Pablo Picasso