Waterfall click light project

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there several categories have gone under figured since group focuses on led's, best equipped answer.

i purposely not including details of plan on using other size , type because conversation end going 50 different directions , asking simple replies. won't long drawn out discussion.

the short of building small encased waterfall leds above illuminate leds not been seen directly. unit 12" tall , 30" wide +/-. using 5mm rgb ca leds. question how many leds recommend? have plenty of them , shift registers. want keep simple have full well.

what think?  10, 15, 20, 30 or 60?

i'll tell perfect number after answer this:

how long piece of string?



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