There was some testing of them. For example there's a demo light post that can be turned on and off with a wand. (It's to demo, it's stored back of house, not in the park). Problem is the wands look goofy (kinda light the light up tip wands that were very briefly around). The second issue (that came about after opening) is with how popular potter is, now do you pull it off without having the light just strobe? You need each kid to be able to do it (so a timer of only once every few minutes isn't going to work) but you need each interaction to be individual (can't have a flashing light, no one knows if their wave worked)