I build 1 meter flexible strip snowfall tubes. I took this video from 15 feet away. They will be at least 50 from viewer. They have great light even from 180 degree side angle. The greatest viewing angle in my show will be 45 degrees at most. I used a T8 fluorescent light protectors. I will connect minimum of 3 together but maybe up 5.
The first one has controller mounted to the top. I glued a 1" pvc coupler to tube to attach the controller.
Video - http://youtu.be/LkoYlPOlu6U