A couple years ago I tried to visit with some people at SolarWindow as I wanted to see for myself all this in action, up close and personal. I was looking at how I could incorporate what they have into what I was contemplating for myself. I went to the NREL and they just took me on a tour of the facility there. I tried to inquire about this product, but was not responded to. So, I don't know. If they have what they say they have, I could have used their product in many ways, if they were willing to work with me, but I the bottom line is, I have to see it personally, in full action, and be able to get answers to all the questions I have.