My former cube neighbor had a house built into the lot next to hers, really close to her house. The new windows were reflecting the light onto her house and me

My former cube neighbor had a house built into the lot next to hers, really close to her house. The new windows were reflecting the light onto her house and melting the siding. I was skeptical that there was enough energy but it does happen. The builder ended up replacing some of the windows with somewhat less efficent ones (not Argon Filled). The windows are designed to reflect heat and UV. http://www.nachi.org/low-e-windows.htm http://www.nachi.org/low-e-windows.htm I can't imagine what a slightly focused light beam would do.