I am a growing DIYer as the companies around the St. Louis metro area are really out priced. Anyways let's get on with the questions

I have a 12ft long area that I am wanting to put a wall on that curves inward a little bit, now on the back, I will be creating a pond in the future. Now back to the subject, on the wall, I want to equally space 3 of the waterfall spillway things that you can see on YouTube if you look it up. The ones I want are color changing water spillways but they are $500 each. I'm not that rich! I was wondering if I bought the spillway without led lighting, could I add it on later and what would the price be for the led strip? I would like personal experiences not the generic look it up on amazon deal.

In case you were wondering also, the water will. Fall onto the ground where there will be a "basin" area and a pump to pump water into all three of them. I am planning on making this wall 6 feet tall and the water spill way, somewhere around the 4.6 feet range high.

The only question was about the led a if buying them later would be cheaper. Also what size would be a good size (12", 18", 24"...) and which dealer is the cheapest because the Atlantic waterfall company is expensive and so is aqua scape.